Do Now: Recall the worst cut you have ever had.

Record the following info in your notes->

• Think of how the cut happened

• Remember the healing process

• Locate the scar (if any) and make observations

Homework: Castle learning

Aim: How do our cells develop, grow and repair?

Reproduction

A characteristic of all living things that result in the

continuation of life from one generation to the next.

Characteristics of Living Things? Organisms have a varied lifespan from a

few hours to many years.

Each organism undergoes a lifecycle from the time of its formation death

One or two parents

I. All Organisms are Made up of Cells.

UNI and Multi Celled organisms MUST reproduce to grow, develop and heal.

II. All living things have DNA that coil into Chromosomes

III. Living things want to ensure their species survival. Organisms MUST reproduce to pass on

hereditary information.

How are all these things accomplished?

The known method is Reproduction and it is grouped

into two main types: Sexual and Asexual.

Explain…Is reproduction necessary for an organism to maintain homeostasis?

Reproduction is needed to pass on hereditary information for the continuation of an organism

BUT….

it is NOT needed to maintain homeostasis!

Sexual Reproduction

2 parent cell (gametes) join together to form offspring

Offspring are UNIQUE

Asexual reproduction A cell that has undergone growth and is ready to divide

is called a MOTHER CELL The division of a

mother cell

gives us 2 equal

daughter cells

Offspring are

identical

What is Mitosis? Is the duplication and

distribution of nuclear material.

(chromosomes/DNA)

Each daughter cell receives the same

number of chromosomes as the

mother cell.

What is the Purpose of Mitosis?

http://www.sciencedaily.com/releases/2014/01/140110102645.htm

Each Species is Different in the Number of Chromosomes

Humans have 46 chromosomes

Dogs have 38 chromosomes

Fruit Flies have 8 chromosomes

But the way in which the chromosomes get distributes when they divide is the

same in all organism

46

46 46

Mitosis in Humans

But the way in which the chromosomes get distributes when they divide is the

same in all organism

38

38 38

Mitosis in Dogs

But the way in which the chromosomes get distributes when they divide is the

same in all organism

8

8 8

Mitosis in Fruit Flies

Which statement concerning production of offspring is correct?

1.Production of offspring is necessary for a species to survive, but it is not necessary for an individual to survive.

2.An organism can reproduce without performing any of the other life processes.

3.Production of offspring is necessary for an individual organism to survive, while the other life processes are important for a species to survive.

4.Reproduction is a process that requires gametes in all species.

Summary

Which row in the chart below best describes asexual reproduction?

RowNumber of

Parents

Comparison ofOffspring to

Parents

1.  

 one  identical

2.  

 one  different

3.  

 two  identical

4.  

  two  different

Asexual reproduction of organisms normally results in new organisms that contain cells with1. more chromosomes than are found in the

cells of the parent 2. half the number of chromosomes 3. the same number of chromosomes 4. fewer chromosomes that are found in the

cells of the parent

Which phrase best describes the process represented in the diagram?

1. germination of a pollen grain in a flower

2. identical gametes being formed by mitotic cell division

3. development of seeds in a ovule

4. daughter cells being formed by mitotic cell division