Question

Codominance is a form of inheritance in which two different alleles for a gene are both expressed, and neither allele is dominant over the other. One example of codominance is blood type in humans; the alleles for type A blood and type B blood are codominant. If a man who is homozygous for type A blood and a woman who is homozygous for type B blood have children, what would you expect to find in the children?

Half will have type A and half will have type B blood.
The children will all have type B blood.
The children will all half type A blood.
The children will all have type AB blood.

Answer 1

D. The children will all have type AB blood

Step-by-step explanation:

I took the test

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Answer 2

First we establish a table of genotypes and phenotypes:

genotype phenotype
AA type A
BB type B
AB type AB

Homozygous type A has genotype AA
Homozygous type B has genotype BB

Now we make the punnett square

A A
B AB AB
B AB AB

So we see that all (100%) of outcomes are type AB.