Biology - Silva

Question 1

How many genes are in a chromosome

Answer 1

2,000

Question 2

What happened at the end of telophase I

Answer 2

Cytokineses

Question 3

Homologous chromosome condense, they begin to form homologous pairs in a process call?

Answer 3

Synapis

Question 4

What are the cell division in mitosis and meiosis

Answer 4

One, Two

Question 5

where does meiosis take place

Answer 5

testes

Question 6

what is the final stage of meiosis I

Answer 6

Telophase I

Question 7

What happens during anaphase I

Answer 7

each homologous chromosome is guided by the spindle fibers.

Question 8

what is the first stage of meiosis I

Answer 8

Prophase I

Question 9

what is the final stage of meiosis II

Answer 9

Telophase II

Question 10

What happened at the end of Telophase I

Answer 10

The cells undergoes cytokineses.

The cells go into interphase again

Question 11

What is a likely result of crossing over during meiosis I?

Answer 11

Production of recombinant gametes

During crossing over, homologous chromosomes trade parts, ultimately resulting in recombinant gametes at the end of meiosis.

Question 12

How many cell divisions occur during meiosis?
A. 2
B. 1
C. 3
D. 0

Answer 12

2

Meiosis consists of two cell divisions. The first occurs during meiosis I and the other occurs during meiosis II.

Question 13

Which of the following statements are true about meiosis II?
A. It results in the formation of four haploid (n) gametes.

B. It results in the formation of two haploid (n) cells.

C. Its goal is to separate sister chromatids.

D. Its goal is to separate homologous pairs of chromosomes.

Answer 13

A. It results in the formation of four haploid (n) gametes.

C. Its goal is to separate sister chromatids.

Question 14

Dr. Evil just discovered a way to prevent crossing over from occurring during meiosis in the gametes of her lab rats.

Which of the following answer choices best describes the effects her discovery would have on the lab rats?

A. Prophase I would be disrupted and there would increased genetic variation in the rats’ offspring.

B. Prophase II would be disrupted and there would reduced genetic variation in the rats’ offspring.

C. Prophase I would be disrupted and there would be reduced genetic variation in the rats’ offspring.

D. Prophase I would be disrupted, but prophase II would occur normally, resulting in increased genetic variation in the rats’ offspring.

Answer 14

A. Prophase I would be disrupted and there would be reduced genetic variation in the rats’ offspring.

Crossing over occurs during prophase I of meiosis I and results in genetic recombination, which promotes genetic variation. If this is prevented, genetic variation would be significantly reduced in the offspring.

Question 15

Which of the following statements are true about meiosis II?
A. It results in the formation of four haploid (n) gametes.
B. Its goal is to separate sister chromatids.
C. Its goal is to separate homologous pairs of chromosomes.
D. It results in the formation of two haploid (n) cells.

Answer 15

A. It results in the formation of four haploid (n) gametes.

B. Its goal is to separate sister chromatids.

Question 16

If a cat cell undergoes meiosis, how many chromosomes will be in the resulting cell?
A. 13
B. 76
C. 19
D. 38

Answer 16

C. 19

Question 17

During meiosis, when does the ploidy (number of sets of chromosomes) get reduced from diploid (2n) to haploid (n)?
A.Once telophase I of meiosis I is complete
B.Once prophase I of meiosis I is complete
C.Once telophase II of meiosis II is complete
D.Once anaphase I of meiosis I is complete

Answer 17

A. Once telophase I of meiosis I is complete

After this stage is complete, the homologous pairs of chromosomes are completely separate from one another in two separate cells, thereby reducing the ploidy from diploid (2n) to haploid (n).

Question 18

What event is labeled as Process Z in the diagram?
Diagram showing interphase and meiosis, broken into three labeled processes: X, Y, and Z

A
Meiosis I

B
Meiosis II

C
Interphase

D
Mitosis

Answer 18

Meiosis II

During process Z, sister chromatids are separating to form four haploid gametes. This occurs during meiosis II.

Question 19

What is the overall purpose of meiosis?

Answer 19

To create gametes

Gamete (sex cell) formation is the major role of meiosis.

Question 20

Which of the following answer choices best describes the effects her discovery would have on the lab rats?

Answer 20

Prophase I would be disrupted and there would be reduced genetic variation in the rats’ offspring.

Crossing over occurs during prophase I of meiosis I and results in genetic recombination, which promotes genetic variation. If this is prevented, genetic variation would be significantly reduced in the offspring.

Question 21

Humans normally have 46 chromosomes spread out over 23 pairs. Down syndrome, also known as trisomy 21, occurs when there’s an extra chromosome at the chromosome 21 pair (shown above).

Answer 21

Sister chromatids fail to separate at chromosome 21 during anaphase II in a parent’s gamete.

This failure to separate results in the formation of a gamete that has two chromosomes at spot 21 when they should only have one. When this gamete fuses with the other parent’s gamete, a total of three chromosomes are at spot 21 in the offspring.

Question 22

Which of the following is true of meiosis?

Answer 22

It produces haploid cells.

Meiosis results in the formation of gametes, haploid cells containing half of the genetic information of a somatic cell