Genetics Ch2

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1

During interphase of the cell cycle, ________.
A) DNA recombines
B) sister chromatids move to opposite poles
C) the nuclear membrane disappears
D) RNA replicates
E) DNA content essentially doubles

E

2

If a typical somatic cell has 64 chromosomes, how many chromosomes are expected in each gamete of that organism?
A) 8
B) 16
C) 32
D) 64
E) 128

C

3

In an organism with 52 chromosomes, how many bivalents would be expected to form during meiosis?
A) 13
B) 26
C) 52
D) 104
E) 208

B

4

For the purposes of this question, assume that a G1 somatic cell nucleus in a female Myrmecia pilosula contains 2 picograms of DNA. How much DNA would be expected in a metaphase I cell of a female?
A) 16 picograms
B) 32 picograms
C) 8 picograms
D) 4 picograms
E) Not enough information is provided to answer the question

D

5

An interesting group of ants consists of several virtually identical, closely related species, with females having chromosome numbers of 18, 20, 32, 48, 60, 62, and 64. If one crossed a female of species (A) with 32 chromosomes and a male species (B) with 9 chromosomes (males are haploid, and each gamete contains the n complement), how many chromosomes would one expect in the body (somatic) cells of the female offspring?
A) 4.5
B) 9
C) 25
D) 32
E) 41

C

6

What is the outcome of synapsis, a significant event in meiosis?
A) side-by-side alignment of nonhomologous chromosomes
B) dyad formation
C) monad movement to opposite poles
D) side-by-side alignment of homologous chromosomes
E) chiasma segregation

D

7

In a healthy male, how many sperm cells would be expected to form from (a) 400 primary spermatocytes? (b) 400 secondary spermatocytes?
A) (a) 800; (b) 800
B) (a) 1600; (b) 1600
C) (a) 1600; (b) 800
D) (a) 400; (b) 400
E) (a) 100; (b) 800

C

8

In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes?
A) 200; 50
B) 100; 50
C) 200; 300
D) 100; 100
E) 50; 50

D

9

If a typical G1 nucleus is 2n and contains 2C (two complements) of DNA, a prophase I cell is 2n and contains 4C of DNA

True

10

S phase is the part of interphase when DNA duplication takes place.

True

11

The centromere of a chromosome separates during anaphase.

True

12

A chromosome may contain one or two chromatids in different phases of the mitotic or meiotic cell cycle

True

13

If a typical G1 nucleus contains 2C (two complements) of DNA, a gamete that is haploid (n) contains 1C of DNA

True

14

During meiosis, chromosome number reduction takes place in anaphase II.

False

15

A bivalent at pachytene contains four chromatids

True

16

The meiotic cell cycle involves two cell divisions but only one DNA replication.

True

17

An organism with a haploid number of 10 will produce 1024 combinations of chromosomes at the end of meiosis.

True

18

An organism with a diploid chromosome number of 46 will produce 223 combinations of chromosomes at the end of meiosis

True