Question

In the following image, the gene H codes for black hair, and h codes for red hair. This follows the Mendelian inheritance pattern - the trait is only determined by one gene. Looking at the following Punnett square, what is the probability that the offspring will have red hair? Explain why in 2-3 complete sentences.

Answer 1

To determine the probability of offspring having red hair (hh) from the Punnett square involving the alleles H (black hair) and h (red hair), we need to analyze the genotypes of the parents. If we assume both parents are heterozygous (Hh), the Punnett square will show the following possible genotypes for their offspring: HH, Hh, Hh, and hh.

Out of these four combinations, only one genotype (hh) results in red hair. Therefore, the probability of the offspring having red hair is 1 out of 4, or 25%. This outcome is based on the Mendelian inheritance pattern, where the recessive trait (red hair) only manifests when both alleles are recessive.