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Flashcards in CMA 1 Deck (81)
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1

In a testcross between a female Drosophila that is heterozygous for two unlinked autosomal genes and a male that is homozygous recessive for both, what is the probability of finding a female fly amongst the offspring with the same genotype as her mother? (Enter your answer in decimal format eg 0.35)
NB Autosomal genes are inherited independent of sex

0.125

2

Corn has a colour gene 'C' and a height gene 'T' with the following phenotypes: CC and Cc = purple; cc = white; TT = tall; Tt = medium; tt = dwarf. What phenotypic ratio would you expect in the progeny of the dihybrid cross CcTt x CcTt?

3:6:3:1:2:1

3

Andy is blood group O, his mother and father are blood group A and B respectively. What is the probability that Andy's new-born sister will be blood group A?

1/4

4

Drosophila, homozygous for a null allele of the ebony gene have black bodies and the ebony allele is recessive to its wild type partner. Drosophila heterozygous for a mutant allele of the Curly gene have curly wings and Curly homozygotes die. Which of the following phenotypic ratios would you expect to see in the living progeny of flies which were heterozygous (mutant/wild type) for both genes?

6:3:2:1

5

The phenotypic ratio expected in the F2 generation of a standard dihybrid cross is 9:3:3:1. If there are 24,000 F2 progeny, how many individuals would you expect to have the least frequent phenotype?

1500

6

Full pod shape (F) is dominant to constricted pod shape (f) and yellow pod colour (Y) is dominant to green pod colour (y) in pea plants. A pure-breeding green plant with full pods is crossed with a pure-breeding yellow plant with constricted pods. What will be the phenotype(s) of the offspring?

All yellow with full pods

7

Full pod shape (F) is dominant to constricted pod shape (f) and yellow pod colour (Y) is dominant to green pod colour (y) in pea plants. A pure-breeding green plant with full pods is crossed with a pure-breeding yellow plant with constricted pods. What will be the phenotype(s) of the offspring?

All yellow with full pods

8

Let W = purple flowers, w = white flowers, D = tall plants and d = dwarf plants. What combination of gametes could be produced by an individual that is heterozygous for both traits?

WD, Wd, wD, wd

9

Let W = purple flowers, w = white flowers, D = tall plants and d = dwarf plants. What combination of gametes could be produced by an individual that is heterozygous for both traits?

WD, Wd, wD, wd

10

Which of the following scientists provided the explanation for the stability of the 50:50 sex ratio in disexual species

Fisher

11

The cross AaBb x AaBb is called a

dihybrid cross

12

The cross AaBb x AaBb is called a

dihybrid cross

13

If a pure-breeding ebony-bodied female Drosophila is crossed with a pure-breeding wild type male and their offspring are allowed to interbreed, how many ebony-bodied flies would you expect to find amongst 8400 F2 progeny?

2100

14

If a pure-breeding ebony-bodied female Drosophila is crossed with a pure-breeding wild type male and their offspring are allowed to interbreed, how many ebony-bodied flies would you expect to find amongst 8400 F2 progeny?

2100

15

A set of genes located on the same chromosome is known as a linkage group. Members of a linkage group can assort independently if...

crossing over occurs between their locations

16

A set of genes located on the same chromosome is known as a linkage group. Members of a linkage group can assort independently if...

crossing over occurs between their locations

17

A pure-breeding wild type female Drosophila was crossed to a pure breeding male with ebony body, brown eyes and vestigial wings. All of the F1 progeny were wild type. If these F1 flies are allowed to interbreed, how many different phenotypes would you expect to see amongst their offspring?

8

18

Which of the following statements about coelacanths is false?

they have lungs but no gills

19

Which of the following statements about coelacanths is false?

they have lungs but no gills

20

In the human ABO blood groups, IA and IB are dominant over IO, but not over one another. IA and IB are said to be ...........

codominant

21

In the human ABO blood groups, IA and IB are dominant over IO, but not over one another. IA and IB are said to be ...........

codominant

22

When a pure-breeding wildtype female fly (genotype bw+bw+, e+e+) is crossed to a pure-breeding brown-eyed, ebony-bodied male (genotype bw bw, e e), the F1 progeny are all wildtype. If the F1 flies interbreed, what is the probability of finding a brown-eyed fly with wildtype body colour amongst their offspring?

3/16

23

When a pure-breeding wildtype female fly (genotype bw+bw+, e+e+) is crossed to a pure-breeding brown-eyed, ebony-bodied male (genotype bw bw, e e), the F1 progeny are all wildtype. If the F1 flies interbreed, what is the probability of finding a brown-eyed fly with wildtype body colour amongst their offspring?

3/16

24

Full Pod shape (F) is dominant to constricted pod shape (f) and yellow pod colour (Y) is dominant to green pod colour (y) in pea plants. Which TWO of the following genotypes could apply to a yellow plant with constricted pods? (Note that choosing more than two options will result in a score of 0)

YYff, Yyff

25

Alternative versions of a gene are called...

alleles

26

Alternative versions of a gene are called...

alleles

27

If a dihybrid individual BbCc is testcrossed, what is the probability of finding an individual that is homozygous for one gene and heterozygous for the other in the resulting generation?

1/2

28

If a dihybrid individual BbCc is testcrossed, what is the probability of finding an individual that is homozygous for one gene and heterozygous for the other in the resulting generation?

1/2

29

If a dihybrid individual BbCc is testcrossed, what is the probability of finding a double homozygous recessive in the resulting generation?

1/4

30

If a dihybrid individual BbCc is testcrossed, what is the probability of finding a double homozygous recessive in the resulting generation?

1/4