Lec 3. Meiosis & Heredity Flashcards Preview

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Flashcards in Lec 3. Meiosis & Heredity Deck (49)
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1

What is the purpose of mitosis?

For growth and to replace worn out cells.

2

What is the outcome of mitosis?

2 cells

3

What is the purpose of meiosis?

To shuffle genetic information and cut the cellular chromosome number in half, from 46 chromosomes to 23 chromosomes

4

What is the outcome of meiosis?

4 cells

5

What happens during Prophase II?

Chromosomes recondense

6

What happens during Metaphase II?

Chromosomes line up

7

What happens during Anaphase II?

Sister chromatids separate and move to opposite poles

8

What happens during Telophase II?

Chromosomes arrive at spindle poles.

9

When does crossing over occur?

Prophase I

10

What happens during Cytokinesis?

Cytoplasm divides

11

What happens during Interkinesis?

Nuclear envelope re-forms, no DNA synthesis takes place

12

How is Genetic variation produced?

Through random distribution of chromosomes in meiosis.

13

Define crossing over

Exchange of genetic material between homologous chromosomes, resulting in shuffling of genes.

14

True or False? Crossing over can result in unequal exchange of genetic material.

True. This can produce chromosomes with deleted or duplicated regions.

15

What is essential for the normal segregation of chromosomes during Meiosis?

Crossing over

16

True or False? Crossing over and mapping, distance is important.

True

17

True or False? Crossover is dependent across the centromere.

False. Crossover is INDEPENDENT across the centromere.

18

Is there cell division during Mitosis?

Yes.

19

Is there cell division during Meiosis I?

Yes.

20

Is there cell division during Meiosis II?

Yes.

21

Is there reduction of chromosome number during Mitosis?

No.

22

Is there reduction of chromosome number during Meiosis I?

Yes.

23

Is there reduction of chromosome number during Meiosis II?

No.

24

Is Genetic variation produced during Mitosis?

No.

25

Is Genetic variation produced during Meiosis I?

Yes.

26

Is Genetic variation produced during Meiosis II?

No.

27

Does crossing over occur during Mitosis?

No.

28

Does crossing over occur during Meiosis I?

Yes.

29

Does crossing over occur during Meiosis II?

No.

30

Does random distribution of maternal and paternal chromosomes occur during Mitosis?

No.