Question

Dimpled cheeks are dominant to un-dimpled cheeks. If two people with dimpled cheeks have a child without dimples, what is the genotypes of the two people? What is the probability that their next child will have dimples?

Answer 1

Step-by-step explanation:

We are given that dimpled cheeks are dominant over un-dimpled cheeks , and two people with dimpled cheeks have a child without dimples .

For child to be born without dimples both of the parents should have one recessive allele.

• So the genotype of both the parents will be Dd ( D = gene responsible for dimpled cheeks ; d = gene responsible for un dimpled cheeks)

For cross between both the parents refer to the attachment.

• From the cross 3 offsprings out of 4 will have dimpled cheeks. Hence ;

`\longrightarrow P(child\ with \ dimpled \ cheeks \ = \ (3)/(4) =\boxed{ 0.75}`