7. A man heterozygous for blood type A marries a woman heterozygous for blood ty

Question

7. A man heterozygous for blood type A marries a woman heterozygous for blood type B. What could be the
possible blood types of their offspring?


8. In watermelons, one gene controls fruit color and the other fruit shape. Genes for green color and short
shape are dominant over their alleles for striped color and long shape. If you crossed a plant having long,
striped fruit with a plant heterozygous for both characteristics, then what would be the expected phenotypic
ratio of the offspring?


9. Colorblindness in humans is a X-linked trait and is recessive to normal vision. A normal woman whose
father was colorblind marries a colorblind man.
a. What offspring would be expected?
b. What offspring would be expected if instead she marries a man with normal vision?

Explanation / Answer

A person with blood type B actually has blood type BO. As with blood type A is actually AO. So the blood types that are possible are: AO, BO, AB, and O.

BO (woman) x AO (man)

Using the punnett square technique would result in the couple having offsprings with either: AB, AO, BO, or O blood type. All having a 25% chance of being possible.

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