1. In humans, blood types A and B are codominant to each other and each is domin

Question

1. In humans, blood types A and B are codominant to each other and each is dominant to O. What blood types are possible among the offspring of a couple of blood types AB and A?

Select one:

a. A and B only

b. A, B, and O only

c. A and AB only

d. A, B, AB, and O

e. A, B, and AB only

2. You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown), br (red), bg (green), and by (yellow). B is dominant to all the other alleles, and by is recessive to all the other alleles. The bg allele is dominant to by but recessive to br. You cross a pure-breeding brown spider with a pure-breeding green spider. Predict the genotype of the progeny.

Select one:

a. B/by

b. Br/bg

c. br/by

d. B/bg

e. by/bg

3. A mother of blood type A gives birth to a child with blood type O. Which of the following could NOT be the blood type of the father? Select one:

a. A

b. Any type is a possible blood type of the father

c. AB

d. B

e. O

4. Crossing two yellow mice results in 2/3 yellow offspring and 1/3 nonyellow offspring. What percentage of offspring would you expect to be nonyellow if you crossed two nonyellow mice? Select one:

a. 100%

b. 33%

c. 75%

d. 25%

e. 66%

5. Coat color is determined by two loci in large cats. Two pink panthers fall in love and produce a large litter of baby panthers with the following phenotypic ratios: 12/16 pink; 3/16 black; and 1/16 whitE. What is the genotype of the pink progeny?

Select one:

a. A_ bb

b. aa bb

c. aa B_

d. A_ B_ and A_ bb

e. A_ B_

Explanation / Answer

1.(e) Blood types that are possible among the offspring of a couple of blood types AB and A are A , B and AB only

2.(d) A cross between pure-breeding brown spider with a pure-breeding green spider wil be

B x bg , So genotypes will be B / bg

3.(c) Mother has blood type A but gives child with blood type O . So the blood type which is impossible for the father will be AB because the possible blood types are A , B and O

4.(a) If two non-yellow mice are crossed with one another then all the offsprings will be non-yellow so percentage will be 100%

5.(d) Since the phenotypic ratio of pink is 12/16 so the genotype of pink progeny is A_B_ and A_bb

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