The ability to taste the chemical PTC is determined by a single gene in humans with the ability to taste given by the dominant allele T and the inability to taste by the recessive allele t. Suppose two heterozygous tasters (Tt) have a large family. QUESTION A: Predict the proportion of their children who will be tasters and non-tasters. Use a Punnett square to illustrate how you make these predictions.

QUESTION B: What is the likelihood that their first child will be a taster?