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Base your answers to the following questions on the diagram below which shows a model of human inheritance.

The parent whose genes are aa …

A
must be dominant

B
has a straight hairline

C
has a peaked hairline

Base your answers to the following questions on the diagram below which shows a model-example-1
User Les
by
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1 Answer

4 votes
aa is the recessive trait - peaked hairline.

This cross is of a parent who has a straight hairline with one who has a peaked hairline - all the kids are heterozygous (Aa) and all will phenotypically have a straight hairline.
User Daniel Casserly
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