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18 notecards = 5 pages (4 cards per page)

Viewing:

Genetics Ch2

front 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

back 1

E

front 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

back 2

C

front 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

back 3

B

front 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

back 4

D

front 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

back 5

C

front 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

back 6

D

front 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

back 7

C

front 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

back 8

D

front 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

back 9

True

front 10

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

back 10

True

front 11

The centromere of a chromosome separates during anaphase.

back 11

True

front 12

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

back 12

True

front 13

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

back 13

True

front 14

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

back 14

False

front 15

A bivalent at pachytene contains four chromatids

back 15

True

front 16

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

back 16

True

front 17

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

back 17

True

front 18

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

back 18

True