The ability to taste PTC is controlled by a single pair of genes. People with the dominant allele (T) can taste PTC, but there is also a recessive (t) non-taster allele. The diagram shows a family tree in respect of whether the individuals are tasters (white) or non-tasters (blue). What is the genotype of person H?

Question

The ability to taste PTC is controlled by a single pair of genes. People with the dominant allele (T) can taste PTC, but there is also a recessive (t) non-taster allele. The diagram shows a family tree in respect of whether the individuals are tasters (white) or non-tasters (blue). What is the genotype of person H?

Answer 1

Person H's genotype is 'tt'.

Answer 2

## Step 1:As per Mendelian genetics, each individual carries two versions (aka 'alleles') of each gene. One allele is inherited from the mother and one from the father.## Step 2:The ability to taste PTC is controlled by one gene pair, mean two alleles. It has a dominant allele (T), promoting the ability to taste PTC, and a recessive allele (t), not enabling PTC tasting ability.### Given that: The presence of at least one dominant allele (T) leads to expression of the ability to taste PTC.## Step 3:Person 'H' specified in the problem statement is a 'no-taster', as denoted by the blue color. Consequently, we can infer that person 'H' lacks the dominant (T) allele, as he/she is a 'no-taster'.### Therefore: Individual's genotype, who can't taste PTC, consisting of two recessive alleles is denoted as **tt** in genetic notation.

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