In humans, free earlobes (E)are dominant to attached earlobes (e)and the presence of freckles (F)is dominant to the absence of freckles (f). If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what is the probability of having a child with attached earlobes and freckles?
A)0%
B)25%
C)50%
D)100%

Question

Quizplus · Accepted Answer

The probability of having a child with attached earlobes and freckles is 25%. This is because the parent with attached earlobes and no freckles is homozygous recessive for both traits (eeff), while the parent with free earlobes and freckles is heterozygous for both traits (EeFf). When these parents mate, the possible genotypes of their offspring are:* EeFf (free earlobes, freckles)* EeFf (free earlobes, no freckles)* eeFf (attached earlobes, freckles)* eeff (attached earlobes, no freckles)The probability of having a child with attached earlobes and freckles (eeFf) is 1/4, or 25%.

In Humans, Free Earlobes (E)are Dominant to Attached Earlobes (E)and