Mitosis
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2. Why aren’t the offspring that result from sexual reproduction exactly like either parent? PowerPoint PPT Presentation


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Mitosis. Meiosis. Number of cell divisions?. Exchange of genetic material between chromosomes?. Number of functioning cell produced from original?. How is the genetic material of final cells produced?. Number of chromosomes of daughter cells compare to parent cells.

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2. Why aren’t the offspring that result from sexual reproduction exactly like either parent?

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2 why aren t the offspring that result from sexual reproduction exactly like either parent

Mitosis

Meiosis

Number of cell divisions?

Exchange of genetic material between chromosomes?

Number of functioning cell produced from original?

How is the genetic material of final cells produced?

Number of chromosomes of daughter cells compare to parent cells

Function of cells produced?

One

Two

No

Yes (crossing over)

Two daughter cells

Four daughter cells

Identical to parent cell

Different from parent cell

The same # of

chromosomes

# of chromosomes is

Divided by one-half

Body cells: body growth and repair

Sex cells for reproduction

2. Why aren’t the offspring that result from sexual reproduction exactly like either parent?

3. Why is it necessary to reduce the number of chromosomes in gametes by one-half?

  • the exchange of genetic information (crossing over) during prophase I

  • The split of chromosomes. Daughter cells contain half of chromosomes than parent cell

To maintain an even number of chromosomes in sexual reproduction


2 why aren t the offspring that result from sexual reproduction exactly like either parent

Label as diploid or haploid


2 why aren t the offspring that result from sexual reproduction exactly like either parent

Meiosis I

Figure 11-15 Meiosis

Section 11-4

Meiosis II

Prophase II

Metaphase II

Anaphase II

Telophase II

Compare parent cells & daughter cells

How are they different?

What two processes cause these differences?


2 why aren t the offspring that result from sexual reproduction exactly like either parent

Meiosis animation. Excellent. http://www.johnkyrk.com/meiosis.html

Mitosis / meiosis animation http://www.pbs.org/wgbh/nova/baby/divi_flash.html

Meiosis and mitosis interactive http://www.biologyinmotion.com/cell_division/index.html


2 why aren t the offspring that result from sexual reproduction exactly like either parent

Crossing-Over

Section 11-4


2 why aren t the offspring that result from sexual reproduction exactly like either parent

1. State 3 differences between mitosis and meiosis:

a.

b.

c.

2. Which diagram best represents part of the process of sperm formation

in an organism that has a normal chromosome number of eigh?


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