Question

Let B represent the dominant gene for a full head of hair, and let b represent the recessive gene for male pattern baldness. The following Punnett square represents the offspring of two people with recessive genes for baldness.

According to the Punnett square, which selection includes all outcomes that would produce an offspring with a full head of hair?

A. Possibility 1
B. Possibility 4
C. Possibilities 1, 2, and 3
D. Possibilities 2, 3, and 4

Answer 1

Possibility 1 (Bb) includes one copy of the dominant gene and represents an offspring with a full head of hair.

Step-by-step explanation:

The Punnett square shows the possible genotypes and phenotypes of the offspring. In this case, the Punnett square represents two people with recessive genes for baldness, which would be bb. To produce an offspring with a full head of hair, we would need at least one copy of the dominant gene, B. Looking at the Punnett square, Possibility 1 (Bb) includes one copy of the dominant gene, so it represents an offspring with a full head of hair.