Quiz 4

Question 1

What stage do chromosomes condense and become visible?

Answer 1

Prophase.

Question 2

What stage does the centromere break and sister chromatids separate?

Answer 2

Anaphase.

Question 3

What stage does the nucleolus reappear?

Answer 3

Telophase.

Question 4

What stage do spindle fibres connect to centromeres?

Answer 4

Prophase.

Question 5

When does cytokinesis occur?

Answer 5

Telophase.

Question 6

When do chromosomes line up at centre plate?

Answer 6

Metaphase.

Question 7

When does the nucleus break down?

Answer 7

Prophase.

Question 8

When do centrosomes migrate to either pole?

Answer 8

Prophase.

Question 9

When do chromosomes unwind and are no longer visible?

Answer 9

Telophase.

Question 10

When is the contractile ring active?

Answer 10

Telophase.

Question 11

What meiotic stage does crossing over occur?

Answer 11

Prophase 1.

Question 12

What meiotic stage do homologous chromosomes separate from each other?

Answer 12

Anaphase 1.

Question 13

What meiotic stage does independent assortment occur?

Answer 13

Anaphase 1.

Question 14

What stage do sister chromatids separate and go to opposite cells?

Answer 14

Anaphase 2.

Question 15

Is a cell at the start of meiosis haploid or diploid?

Answer 15

2N

Question 16

Is a cell at the end of mitosis haploid or diploid?

Answer 16

2N.

Question 17

Is a cell at the end of meiosis 1 haploid or diploid?

Answer 17

N.

Question 18

Is a cell at the end of meiosis 2 haploid or diploid?

Answer 18

N.

Question 19

Is a zygote haploid or diploid?

Answer 19

2N.

Question 20

Is an egg haploid or diploid?

Answer 20

N.

Question 21

What process of meiosis beings at puberty and then goes on through life?

Answer 21

Spermatogenesis.

Question 22

What is the first meiotic division that actually occurs when an individual is an infant?

Answer 22

Oogenesis.

Question 23

What meiotic stage do polar bodies occur?

Answer 23

Oogenesis.

Question 24

Given a cell that has 10 chromosomes, how many chromatids will there be at the start of mitosis?

Answer 24

20.

Question 25

Given a cell that has 10 chromosomes, how many chromatids will there be there at the end of mitosis?

Answer 25

20.

Question 26

Given a cell that has 10 chromosomes, how many chromatids will there be at the start of meiosis?

Answer 26

20.

Question 27

Given a cell that has 10 chromosomes, how many chromatids will there be for each cell at the end of meiosis 1?

Answer 27

10.

Question 28

Given a cell that has 10 chromosomes, how many chromatids will there be for each cell at the end of meiosis 2?

Answer 28

5.

Question 29

Define centromere.

Answer 29

Holds sister chromatids together.

Question 30

Define chromatin.

Answer 30

What chromosomes are composed of in loose and unwound stage.

Question 31

Briefly describe crossing over.

Answer 31

Homologous chromosomes share DNA with each other, resulting: sister chromatids will no longer be identical.

Question 32

Briefly describe independent assortment.

Answer 32

Cant predict what pole chromatids will go to, happens during anaphase. Homologous chromosomes will separate from each other.

Question 33

Outline the process of spermatogenesis.

Answer 33

Occurs in the testes of males. Produces sperm. Primary spermatocyte undergoes meiosis 1, turns into 2 secondary spermatocytes. Meiosis 2 occurs and 4 spermatids result which then mature into sperm.