animal survival - integrated science · 2019-09-20 · reproduction in fish (external...
TRANSCRIPT
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Animal
Survival
Chapter 7: Reproduction
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Survival of a species
Living organisms eventually die, so in order for a species to survive it must produce sufficient young to replace those
that are lost through old age, predation and disease.
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Reproduction in fish
(external fertilisation)
The female lays her eggs first and the male follow depositing his sperm adjacent to the eggs.
The sperm swim through the water to the eggs attracted by a
chemical given off by them
Stickleback
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Fish Eggs
In fish, eggs are protected by flexible coverings and that the embryos obtain food from enclosed yolk.
Yolk
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Fish produce a large number of eggs because . . .
•Those eggs that do become fertilised receive little or no
parental care
•External fertilisation is inefficient and wasteful
•The chance of a sperm meeting an egg
is relatively low
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Care of Young
Young fish emerge from the eggs able to look after themselves without help from there parents.
After its yolk runs out a young fish begins to catch its own food and develops into an adult fish
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External Fertilization
Outside the animals inthe surrounding environment (external fertilisation)
An advantage of externalfertilization is that it resultsin the production of a largenumber of offspring
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What are the advantages of external fertilisation?
Advantages
Disadvantages
Lots of eggs being produced and more offspring
The eggs and young can be eaten by other animals
They have to find food and protect themselves
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Internal
Inside the female (internal fertilisation)
An advantage of internal fertilisation is that the foetus gets all of the nutrients it needs
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What are the advantages of internal fertilisation?
Protect the baby
Supply of food and nutrients
Disadvantages
If the mother has any diseases or toxic substances in her blood it could pass to the baby
Only have a few offspring at a time
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•The eggs are well protected being
inside the mother
Mammals produce far fewer eggs because . . .
•Internal fertilisation is more efficient
•There is a greater chance of sperm cells
fertilising the egg
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At birth, the young of mammals are dependent on the adult for care and protection.
Care of young in mammals
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Number of young
vs. parental care
The more young an animal has the less parental care is involved e.g. fish.
And the les young produced the more parental care is involved e.g. mammals
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GametesSperm Egg
FertilisationNumber of young vs.
parental care
The fewer offspring the
greater the parental care
Produced in Testes:•Small•Has tail •No food
Fertilisation occurs when the sperm and egg fuse
together combining their genetic material.
Produced the Ovaries:•Large
•own food •No tail
Reproduction
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Gametes
Reproduction occurs via gametes or sex cells.
Female gametes are called eggs
and male gametes are called sperm.
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Sperm
The male produces large amounts of sperm. Sperm is produced in the Testes, it is small, it has a tail and it doesn’t carry any food
HeadNucleus
Tail
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The Sperm cell
Taill
Why does it have a tail?
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The Sperm cell
Explain how a sperm cell is adapted for its function
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Eggs
Females produce a smaller number of eggs. Eggs are produced in the Ovaries. Eggs are large, they have their own food and the do not have a tail.
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What is an ovum?
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What is an ovum?
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What is an ovum?
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Egg Cell
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Reproduction in
mammals
(internal fertilisation)
In mammals and most land animals there is no water medium for the sperm to swim through so sperm is
deposited into the body of the female
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Reproductive organs of a mammal
Sperm duct
Penis
Testis
Oviduct
Ovary
Uterus
Vagina
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Today we will learn about the male reproductive system
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The male reproductive system
O
What do we know?Can you identify anything on the diagram?
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The male reproductive system
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The male reproductive system
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The male reproductive system
Label the diagram
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The male reproductive system
Outcomes:
Use key words to label the male reproductive system
Describe the function of each part of the male reproductive system
Explain how the sperm cell is adapted for its function
Part Function
Penis
Urethra
Spermduct
Testicles
Gland
Foreskin
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What does each part do?
Write down the function of each part on your diagram. Use the descriptions on the board to help you.
These secrete a liquid to add to the sperm. The sperm and liquid together is called semen.
This skin surrounds the testicles.
This joins to the sperm duct. Semen and urine leave the penis through this.
The sperm is produced here .
The sperm travels up this tube from the testicles.
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Today we will learn about the female reproductive system
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The female reproductive organ
What do we know?Can you identify anything on the diagram?
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The female reproductive organ
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The female reproductive organ
Label the diagram of the reproductive organs
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What does each part do?
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The female reproductive system
Outcomes:
Use key words to label the female reproductive system
Describe the function of each part of the female reproductive system
Explain how the female egg cell is adapted for its function
Part Function
Ovary
FallopianTube
Womb/Uterus
Cervix
Vagina
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What does each part do?
Write down the function of each part on your diagram. Use the descriptions on the board to help you.
These release the egg cells
This is the tube that the egg travels down to get to the womb. Fertilisation usually happens here.
This is where the fertilised egg would implant and develop into a foetus.
This holds the foetus in place if the egg has been fertilised. It is a muscle that closes the top of the vagina.
This is a muscular tube that opens to the outside of the body.
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Mammal
Reproduction
Because no water medium for the
sperm to swim through
Internal Fertilisation
Copulation
Reproductive organs
Produce fewer eggs
Fertilisation Placenta
•Sperm duct
•Penis
•Testis
•Oviduct
•Ovary
•Uterus
•Vagina
• Greater chance of sperm meets egg
• Eggs protected inside mother
• Internal fertilisation is more efficient
Sperm transmitted from penis to vagina swims up
uterus into oviducts
The fertilised egg passes down the oviduct and
becomes attached to the wall of the uterus.
The placenta is an organ which allows substances to move from the mother’s blood to
babies’ blood
Provides nourishment, gas exchange and excretion for the
foetus
Young mammals
need a lot of
parental care
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?
18/09/2019 41
Copulation
During copulation the penis is inserted into the vagina.
Sperm is released from the penis and they swim up the uterus and into the oviducts
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Fertilization
For a new individual to be formed by sexual reproduction, fertilisation must occur.
Once the gametes have fused the new cell is
called a zygote.
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What is fertilisation?
When the sperm and the egg FUSE together.
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Fertilisation
The fertilised egg passes down the oviduct and
becomes attached to the wall of the uterus.
It develops in fluid of the amniotic sac and
obtains food from the maternal circulation
(mothers’ blood)
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Sperm and the eggWhat do each of these have?
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A nucleus which contains the DNA
The nucleus carries your DNA.
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Where did you get your DNA from?
You got half of your DNA from your mum and half from your dad
Who did you inherit you eye colour from?
Nose shape?
Hair colour?
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Which egg is fertilised? How do you know?
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What is fertilisation?
Draw this diagram in your notes and explain what is shows.What is this process called?
½ the amount of DNAEGG CELL
½ the amount of DNA
SPERM CELLTotal amount of DNA →ZYGOTE
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What happens to the zygote?
After fertilisation the zygote continues to move down the fallopian tube/oviduct to the uterus
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What is fertilisation?
The fertilised egg (Zygote) Then divides and copies itself several times. It then becomes a ball of cells called an embryo.
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What is fertilisation?
Lining of womb/uterus thickens ready to receive the embryo
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Implantation?
Embryo attaches itself to the uterus
wall. This is called IMPLANTATION.
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Today we will learn about Foetal development and pregnancy
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What happens after fertilisation?
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What happens after fertilisation?The zygote (fertilised egg) divides and copies itself. This is called an embryo. The embryo floats towards the uterus/womb.
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Embryo implants in the uterus wall
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A placenta starts to develop
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The placenta
The placenta is an organ of nourishment, gaseous exchange
and excretion for the foetus
Blood vessels from the baby form finger like projections into the maternal blood supply so that
diffusion can take place
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3-5 weeksWEEK 3-5 The embryo’s tiny heart begins to beat by day twenty-one. Arm and leg buds are visible and the formation of the eyes, lips, and nose has begun. The spinal cord grows faster than the rest of the body giving a tail like appearance which disappears as the embryo continues to grow. The placenta begins to provide nourishment for the embryo.
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A placenta starts to develop
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A placenta starts to developWeek 7
Major organs have all begun to form. The embryo has developed its own blood type, unique from the mother’s. Hair follicles and knees and elbows are visible.
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WEEK 8-12
The embryo is reactive to its environment inside the amniotic sac where it swims and moves. Hands and feet can be seen.
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Weeks 13-16
The brain is fully developed and the foetus can suck, swallow, and make irregular breathing sounds. Foetus can feel pain.
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Week 20-24
Foetus has a hand and footprints and fingerprints are forming. Foetus practices breathing by inhaling amniotic fluid into its developing lungs.
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Weeks 25 – 28
Rapid brain development occurs during this period and the nervous system is able to control some bodily functions. The foetus’ eyelids now open and close. At 25 weeks there is a 60% chance of survival if born.
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Weeks 29 –32
There is a rapid increase in the amount of body fat the foetus has. At this point there the survival rate is above 95% if the baby is born.
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Task-Pregnancy worksheetWrite the correct statement next to
the correct picture.
Outcomes:
Identify the key stages during pregnancy
Describe how the mother and baby exchanges substances
KeywordsZygoteEmbryoUmbilical cordFoetusOxygenCarbon dioxideGlucose
The foetus is fully
developed and ready to be
born, it is about 50 cm
long and about 3.5kg
The foetus is 30cm long
and the brain is very
active. The foetus sleeps
and wakes at regular
intervals
The embryo is now
called a foetus and has
human features
The foetus has defined
fingers and toes and
begins to grow hair,
eyelashes and nailsThe foetus is 7 cm long
and has all body parts are
in place
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Answers
Week 40
Week 30
Week 20
Week 10
Week 8
The foetus is fully developed and ready to be
born, it is about 50 cm long and about 3.5kg
The foetus is 30cm long and the brain is very
active. The foetus sleeps and wakes at regular
intervals
The foetus is 7 cm long and has all body
parts are in place
The embryo is now called a foetus and has
human features
The foetus has defined fingers and toes
and begins to grow hair, eyelashes and
nails
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How does the foetus get oxygen?
Any ideas?
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The placenta
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Placenta
OxygenWaterVitaminsDrugs (some)
Viruses (almost all)
NutrientsCarbon dioxideWaterWaste products
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How does the foetus get the substances it needs?
Agony Aunt
Dear Agony Aunt,
I am pregnant and I am wondering How my baby gets
all the nutrients and oxygen it needs. Also, If I smoke
will it affect the baby?
From Jenny
Task: Write a response to Jenny to explain how her baby gets the oxygen and nutrients it needs and gets rid of the waste products. You should explain if they baby is affected by smoking.
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What about twins?
Identical Non-Identical
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Twins
Identical Non-Identical
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Conjoined twins
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Conjoined twins
The copied cells do not separate properly! They start to develop individually even though they are joined.
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True or false
1. When a zygote divides into a ball of cells it is called an embryo.
2. Oxygen passes from the foetus to the mother
3. Nutrients pass to the foetus from the mothers blood.
4. Smoking will not harm a baby
5. Alcohol and some other drugs will harm the baby.
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Today we will learn about puberty
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What makes these changes happen?
HORMONES chemicals in the body
Male hormone
Testosterone
Female hormone
Oestrogen
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Who is this? What’s changed?
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Hips widen
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Pubic (body) hair grows
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Voice breaks
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Body Odour
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Sperm are produced in the testicles
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Eggs are matured in the ovaries
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Penis grows/ Breast grow
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Shoulders widen
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What makes these changes happen?
Girls usually start puberty first
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Males:Sperm production beginsPenis growsHair growsBody odourVoice breaksShoulders widen
Females:Hips widenPubic hairUnderarm hairBreasts growOvaries begin to release eggsBody odour
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Male FemaleBoth
There are 8 different changes
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Puberty
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Puberty
Female changes Common changes Male changes
sex organs get larger face and body hair
layers of fat
Draw the table in the your book and fill in the table with correct changes
menstrual cycle
pubic and under-arm hair
sweat glands develop
hips widen
sperm produced
muscles develop
breasts develop
growth spurt
voice deepens
sex hormones circulate
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When a girl goes through puberty one of the changes that occurs is that she will begin to have periods.
This is the female body’s way of preparing to reproduce
A woman’s reproductive system works on a 28 day cycle
This cycle is known as the menstrual cycle
The menstrual cycle consists of A number of stages
In this lesson we will learn what those stages are.....
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Day 1 – 7
- Uterus wall breaks down
- The woman bleeds through her vagina
- This is a period
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Day 7 - 13
- Around day 7 the blood flow stops.
- Uterus wall builds up again
- An egg matures in the ovaries
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Day 14 (The Middle)
- On the 14th day, the egg is released from the ovary
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Day 14 - 17
- Egg travels down the oviduct
- It can last for around 3 days
- If it meets a sperm in the duct, it becomes fertilised
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Day 18 - 28
- If the egg is not fertilised, the uterus wall breaks down
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Day 1 – 7
- The cycle then starts over again
- The unfertilised egg exits the body with the uterus lining
The cycle starts over again...
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Question True/ false Challenge: Why1. The menstrual cycle lasts for 28 days2. The uterus wall builds up at the start of the cycle3. Eggs are made in the ovaries
4. The ovaries travel down the oviducts when released and can last for 3 days5. If the eggs is fertilised, the uterus wall breaks down6. A period is when the cervix breaks down and bleeds7. The place where an egg will meet a sperm is in the oviduct8. The best time to get pregnant is between days 14-17