4.In humans, the allele which confers the ability to roll the tongue is dominant over the allele which does not confer the ability to roll the tongue. If a man who can roll his tongue and whose mother could not mates with a woman who cannot roll her tongue, what proportion of the children would be expected to be able to roll their tongues if they have a large number of children

The correct answer is - 1/2

Explanation:

the ability to roll the tongue is dominant over those who can not roll the tongue. The man is Rr (man), heterozygous. The woman is recessive and can not roll

Rr (man) x rr (woman)---Parents

           r

RRr (roll)

rrr (cann't roll)

The probability of their children to able to roll = 1/2 = 50%

it is prolly d and c and f

c should be the answer