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Flashcards in EXAM 1 Deck (20):
1

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(G2 of interphase)

12 chromosomes and 24 DNA molecules

2

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(Metaphase I of meiosis)

12 chromosomes and 24 DNA molecules

3

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(Prophase of mitosis)

12 chromosomes and 24 DNA molecules

4

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(Anaphase I of meiosis)

12 chromosomes and 12 DNA molecules

5

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(Anaphase II of meiosis)

12 chromosomes and 12 DNA molecules

6

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(Prophase II of meiosis)

6 chromosomes and 12 DNA molecules

7

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(After cytokinesis following mitosis)

12 chromosomes and 12 DNA molecules

8

A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages?
(After cytokinesis following meiosis II)

6 chromosomes and 6 DNA molecules

9

The fruit fly Drosophila melanogaster has four pairs of chromosomes, whereas the house fly Musca domestica has six pairs of chromosomes. Other things being equal, in which species would you expect to see more genetic variation among the progeny of a cross? Explain your answer.

The variation in the progeny of a cross would depend on the number of possible ways the genome (and subsequently the variation it contains) can assort. With its genome divided into six linkage groups, the house fly would have more possible combinations than the fruit fly’s genome with only four linkage groups, sixteen times more, in fact.

10

Diploid

containing two complete sets of chromosomes, one from each parent.

11

Haploid

having a single set of unpaired chromosomes.

12

Monohybrid crosses

mating between two individuals heterozygous at one gene locus= Rr x Rr (B- x bb)

13

Dihybrid crosses

both parents are heterozygous at 2 different gen loci = T t D d x T t D d (G-H- x gg hh)

14

Testcross

mating of individual with dominant phenotype to a homozygous recessive= R- x rr (where R- could be RR or Rr)

15

Product rule

for 2 or more independent events occurring together, you x the independent probabilities

16

Stages of PROPHASE I of meiosis

Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis

17

In metaphase I of meiosis, the _____ (which are also termed tetrads) are aligned along the metaphase plate.

Bivalents

18

The anaphase stage of meiosis I is characterized by the separation of the two_____ of a tetrad from each other and their migration to opposite poles of the cell.

Homologs

19

In meiosis, crossing over refers to the physical exchange of pieces between?

non-sister chromatids of homologous chromosomes

20

Mitosis (3)

-Kinetochores begin attaching to spindle fibers
-sister chromatids separate and move to opposite poles
-chromosomes condense, and nuclear envelope breaks down