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urly hair and the ability to taste the chemical PTC are inherited traits. Curly hair (H ) is always dominant to straight hair (h ). The ability to taste PTC (P ) is always dominant to not being able to taste PTC (p ). The alleles for straight hair and a non-taster for PTC are recessive.



If both parents are heterozygous for both traits, what would be the genotype of an offspring with straight hair and the ability to taste PTC?

hhpp

hhPp

Hhpp

HhPp

1 answer

To find the genotype of an offspring with straight hair (hh) and the ability to taste PTC (P_), we start by analyzing the parent genotypes:

Both parents are heterozygous for both traits, which means their genotypes are HhPp.

1. Hair Type:

  • For hair type, curly hair (H) is dominant over straight hair (h). Since the offspring has straight hair, it must have the genotype hh.

2. Ability to Taste PTC:

  • The ability to taste PTC (P) is dominant over not tasting PTC (p). Since the offspring can taste PTC, it must have at least one dominant allele (P). The possible genotypes for the ability to taste PTC could either be Pp (heterozygous) or PP (homozygous dominant).

However, since the offspring has straight hair (hh), the only way to achieve the combination of traits (straight hair and the ability to taste PTC) is with the genotype:

hhPp (where hh represents straight hair and Pp represents the ability to taste PTC).

Therefore, the correct answer is hhPp.