Question

Suppose unattached earlobes are a dominant trait. Phil and Maggie both have unattached earlobes but their daughter, Celia, does not. If Phil and Maggie have a second child, what is the probability that he or she will have attached earlobes?

A. 1/4
B. 1/2
C. 3/4
D. 1/8
E. 1

Answer 1

The correct option is A. 1/4

Step-by-step explanation:

Let's try to interpret the results by drawing a punnet square for the cross.

Let's consider E to be the dominant allele and e to be the recessive allele.

The cross can be shown as :

E e

E EE Ee

e Ee ee

The results from the punnet square prove that 1/4 of the offsprings will have a chance to have attached earlobes.