A couple with the ability to taste PTC have two grown sons and one grown daughter. The sons have the ability to taste PTC. Their daughter is a PTC non-taster. She married a PTC non-taster man, and they have two sons.

16. Construct a pedigree in the box below that fully represents the above scenario and tracks the inability to taste PTC (non-taster), which is caused by two recessive "t" alleles. In your pedigree, please make sure that:

-The correct shapes for males and females are used.

-The shapes that require shading are shaded.

-The genotypes are listed next to each pedigree shape.

Explanation:

A couple with the ability to taste PTC have two grown sons and one grown daughter.

The sons have the ability to taste PTC.

Their daughter is a PTC non-taster.

To produce a non taster with two recessive alleles, it means both parent has one copy each of the recessive allele t and the also possess the one copy of the dominant allele T to make them tasters ie they are heterozygote for the trait.

The square represents male and the circles represent females. The non-tasters are the affected and are shaded.

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