What about tracking an autosomal dominant trait, such as having a widow's peak? The presence of one dominant allele for this widow's peak hairline (H) will result in an individual having a widow's peak. Since this pedigree is

tracking an autosomal dominant trait, shaded shapes have a widow's peak hairline. *Note: In reality, this trait may

be more complex than just a simple gene.

Hh

hh

I

hh

HH

II

?

?

1

2

23.

How many dominant alleles does an individual need in order to have the autosomal dominant trait?

24.

Is it possible to know the genotypes of the three children in generation III?

1

notes

No