Question

Blood type is inherited through multiple alleles. A В are co dominant and o is recessive. If the father has type Ao blood, and the mother is Bo; what is
the chance do they for an O type offspring?
1) 0%
2)25%
3)50%
4)75%

Answer 1

Answer:

2) 25%

Explanation:

To answer this question, we can draw a punnett square.

Father has type Ao, so he has one A allele, and one o allele.

Mother is type Bo, so she has one B allele, and one o allele.

_  |  A   |  o

B  | AB | Bo

o  | Ao | oo

25% AB, 25% Bo, 25%, Ao, 25% oo

Since blood type o is recessive it will only be expressed phenotypically when not masked by a dominant allele which only occurs when the genotype is oo. Therefore the answer is 2) 25%.

Hope this helped!