In humans, widow peaks are dominant to straight hairlines and freckles are dominant to no freckles. a woman who is homozygous for her widow's peak and heterozygous for freckles marries a man that has a straight hairline and is also heterozygous for freckles. determine the phenotypic ratio. what is the probability that they have a child who looks like dad?

None.

Explanation: Since the mother is homozygous dominant for a widows peak, it would mask the recessive gene of the father’s straight hairline. There is a 100% chance that the child will have a widows peak, and a 75% that the child will have freckles.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.