1. In hamsters, B is a dominant allele coding for black fur and w is a recessive

Question

1. In hamsters, B is a dominant allele coding for black fur and w is a recessive allele coding for white fur. Match up the appropriate probabilities of mating outcomes with the parental genotypes.

There is a 50% chance offspring are either black or white

2. The following question deals with the ABO blood group.  Recall that A and B alleles are co-dominant over the allele O.  Jill, who has type AB blood, marries Jack who has type B blood, but whose mother has type O blood. What are the genotypes of Jack, Jill, and Jack's mother?

A. Jack: B

Jill: AB

Jack's Mother: O

B. Jack: BB

Jill: AB

Jack's Mother: OB

C. Jack: BBO

Jill: ABO

Jack's Mother: OOO

D. Jack: BO

Jill: AB

Jack's Mother: OO

E. Jack: BB

Jill: AB

Jack's Mother: OO

Probabilities Matching Outcomes All offspring are black A. ww x ww All Offspring are white B. Bw x ww

There is a 50% chance offspring are either black or white

C. BB x ww The chance of a white offspring is 25% D. Bw x Bw

Explanation / Answer

Well the genotypes are:

All offsprings are black- BB X ww (c)

All offsprings are white- ww X ww (a)

There are 50% chance that offsprings are either black or white- Bw X ww (b)

25% offsprings are white- Bw X Bw (d)

2.

The correct genotype of jack will be BO

That of Jill is AB (as given)

And of his mother is OO

Hence optionD is correct

This is the only correct genotype because the O Blood group type is always present in the homozygous recessive form. Jack must have inherited the allele O from his mother and B from his father.

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