Question

pinkys parents have one gene for ptc tasting and one gene for no ptc tasting. t t. their genotypes are
heterozygous
homozygous dominant
homozygous recessive
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Explanation:

Heterozygous genotypes have two different alleles. Since Pinky's parents have one gene for PTC - tasting (T) and one gene for non - PTC - tasting (t), they are heterozygous. Homozygous dominant would be two dominant alleles (TT) and homozygous recessive would be two recessive alleles (tt).

Answer:

heterozygous