The ability to roll one’s tongue(R) is dominant over non-rolling (r). The abilit

Question

The ability to roll one’s tongue(R) is dominant over non-rolling (r). The ability to taste PTC (T) is dominant over non-taster (t). Suppose a woman who is both homozygous tongue-roller and a non-taster marries a man who is heterozygous tongue-roller and is a PTC- taster, and have three children: a homozygous tongue-roller who is also a PTC- taster, a heterozygous tongue-roller who is also a taster, and a heterozygous tongue-roller who is a non-taster.

a.If these parents would have a bunch of more children so that they had 12 in all, how many of these 12 would you expect to be non-tasters who are homozygous for tongue-rolling?

b.If the first child (the homozygous tongue-roller who is a PTC-taster) marries someone who is heterozygous for both traits, draw the Punnett square that predicts what their children would be.

Explanation / Answer

Woman RRtt; Man RrTt

(a) Homozygous tongue rollers would be 4 in 12

B) homozygous tongue-roller who is a PTC-taster - RRTt- RRTT marries someone who is heterozygous for both traits, their children would be:

RT Rt rT rt Rt RRTt RRtt RrTt Rrtt Rt RRTt RRtt RrTt Rrtt Rt RRTt RRtt RrTt Rrtt Rt RRTt RRtt RrTt Rrtt

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