Topic: ReproductionAim: Describe the 2 types of development and

how the fetus is nourished.

Do Now: Embryonic development notes #’s 10 - 16

HW: Finish reading notes. Chromosome structure Review ISN

CL Mitosis and Asexual Reproduction due tomorrow!

10. Identify the process represented by process 1. 11. Identify the name structure 2 and how many chromosomes it contains (in humans). 12. Identify the process occurring in structures 3 and 4. 13. Identify structure 5. 14. Identify structure 6. 15. Identify structure 7 and the three layers that make up this structure. 16. Identify the process that occurs after structure 7 is formed.

Fertilization

Zygote – 46 chromosomes

CleavageMorula

Blastula

Gastrula – endoderm, mesoderm, ectoderm

Differentiation

Identify each stage in cell division.

AD

BE

C F

Telophase

Interphase

Metaphase

Anaphase

Interphase

Prophase

Describe the effect of a blockage in areas A and B on the male and female reproductive systems.

Topic: ReproductionAim: Describe the 2 types of development and

how the fetus is nourished.

Do Now: 1. Take out the chromosome structure ISN.2. Compare and Contrast mitosis and meiosis

using a Venn Diagram.

HW: Asexual Reproduction Review ISN

chromatid

centromere

chromatid

centromere

gene

Interphase

MITOSIS MEIOSIS

SIMILARITIES2 daughter cells 4 daughter cells

Asexual Reproduction

Sexual Reproduction

Chromosome # stays the same

Chromosome # splits in half

Used to reproduce somatic cells

Used to produce gametes

Chromosome replication occurs

Cytokinesis occurs

Same phases

1 division 2 divisions

• # of cells• Type of reproduction• Chromosome #• Types of cells• Divisions

1. Describe the amnion.

• Thin layer that forms a sac around the embryo

2. Identify the substance found inside the amnion.

• Amniotic fluid

3. Describe the importance of the amniotic fluid.

• Protects, cushions and insulated the embryo.

4. Describe the importance of the placenta.

• Provides food and oxygen • Removes wastes

5. Identify the structure that connects the fetus and the mother.

• Umbilical cord

6. Identify what is found inside the umbilical cord.

• Blood vessels

7. Identify the substances that can pass from the mother to the fetus.

• Oxygen and nutrients• Alcohol and drugs

8. Identify the substances that can pass from the fetus to the mother.

• Metabolic wastes

9.Does blood from the mother and fetus mix? Explain why or why not.

• No• Mother and child have their own

separate circulatory system.

10. Identify each labeled structure in the internal development diagram on the back of this page. cervix

Umbilical cord

Placenta Oviduct

Amniotic fluid

External Development

•Development outside female

•In water or on land

•Source of food - YOLK

•Ex: Birds, fish, frogs…

Egg Layers:All turtles

All tortoises

All crocodilians (group of large reptiles that includes crocodiles, alligators and caimans)

Some lizards: Iguanas, Water dragons, Geckos, Veiled chameleons, Panther chameleonsIguanas Water dragons Geckos

Veiled chameleons Panther chameleons

Internal Development

• Development inside female

Let’s summarize…1. What is the food source of the embryo that is

developing externally?2. What is the food source of the embryo that is

developing internally?

Amniotic fluid

Umbilical cord

•By Day 21 the heart begins to beat.

•By the 4th week, the backbone and muscles are forming. Arms, legs, eyes, and ears have begun to show.

•By only Day 20 foundations of the brain, spinal cord

and nervous system are already

established.

•Now one month old, the embryo is 10,000 times larger than the original fertilized egg and is developing rapidly.

•At Week 5 five fingers can be discerned in the hand. The eyes darken as pigment is produced.•Brain waves can be detected and recorded.

•At Week 6 the liver is now taking over production of blood cells, the brain begins to control muscle movements and organs.

•By the 8th Week the now-called fetus is a little more than an inch long. The fetus has now everything found in a fully developed adult.

•The heart has been beating for more than a month, the kidneys are functioning; the stomach is producing

digestive juices.•And it responds to touch.

• At Week 9 the tiny one has fingerprints and will curve its hand around an object placed in its palm.

• By Week 10 the fetus can squint, swallow, and wrinkle its forehead.

At the 11th week, the fetus is now about 2 inches long. Urination occurs. Muscle movements are becoming more coordinated.

3m

•Now 3 months old, the unborn sleeps, awakens, and exercises its muscles. It “breathes” amniotic fluid to help develop its respiratory system.Fine hair is growing on the head.

•At 4 months the fetus is 8-10 inches long and weighs half a pound.•The mother starts to “show.” The baby’s ears are functional.•It can hear its mother.

•The fetus at 5 months is now about 12 inches long. There is definite movement felt by the mother. The unborn may jump in reactions to startling or loud noises.

•At the 6th month oil and sweat glands are now functioning. The delicate skin is protected from the fetal waters by a special ointment called “vernix.”

Born now and given proper care,

the baby would survive…

•At Month 7 the baby now uses the four senses of hearing, vision, taste, and touch. The child can respond to his or her mother’s voice.

•In the 8th month the skin begins to thicken with a layer of fat stored underneath for insulation and nourishment. Antibodies increasingly build up.

•The baby is nearly ready for life outside the womb.

•Toward the end of this month the baby is ready for birth. By this time the infant

normally weighs 6 to 9 pounds, and his or her heart is pumping 300 gallons of blood

per day.

http://www.brainpop.com/health/geneticsgrowthanddevelopment/fetaldevelopment/