Question

Human blood is considered a multiple allele trait meaning an individual can have either (A,

B, AB, or O). Which phenotypic probability would be expected between a cross of a male
with Type O and woman with Type AB?
a. 50% Type A, 50% Type B
. b. 50% Type A, 50% Type O
50% Type AB, 50% Type 0
d. 50% Type B, 50% Type O
c.

Answer 1

A. 50% Type A, 50% Type B

Step-by-step explanation:

To answer this we can draw a punnett square.

Since o if recessive, it can only be expressed if it is not masked by a dominant allele. Therefore the male with type O blood has the genotype oo. A and B are co-dominant, so the woman has genotype AB.

_ | A | B

o |Ao | Bo

o | Ao | Bo

Since A and B are dominant alleles, they will mask the o allele. Therefore genotype Ao will be a Type A phenotype, and genotype Bo will be a Type B phenotype.

Therefore, the phenotypic probabilities for this cross is 50% Type A, 50% Type B. Hence, the answer is A.

Hope this helped!