In the Punnett square for the gene that determines hair color, if we assume one parent is homozygous dominant (HH for black hair) and the other parent is homozygous recessive (hh for red hair), all offspring will inherit at least one dominant allele (H), resulting in 100% having black hair (genotype Hh). Therefore, the probability that the offspring will have red hair (hh) is 0%, as there are no possible combinations that would give a recessive phenotype in this scenario. If there were other combinations of genotypes involved, the results would differ, but with the given combination, the offspring cannot exhibit red hair.
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.
3 answers
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If one parent is homozygous dominant (HH) and the other is homozygous recessive (hh), all offspring will inherit at least one dominant allele (H), resulting in 100% having black hair (Hh). Thus, the probability of offspring having red hair (hh) is 0%.