## homework help!!!

Genetics as it applies to evolution, molecular biology, and medical aspects.

westernbio129
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Joined: Wed Feb 11, 2009 2:39 am

### homework help!!!

The organic compound PTC tastes bitter to most persons. Inability to taste PTC is caused by having the homozygous recessive genotype "tt". In the US about 70% can taste PTC. What is the frequency of the taster "T" and the non-taster "t" genes?

whizzbee
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Joined: Mon Sep 17, 2007 3:35 am
Location: Indonesia
70 % of the people can taste PTC
30 % can't
30% = 0.3

non-taster = tt = t^2 = 0.3
t = square root of 0.3
T = 1 - square root of 0.3
always aim for the sky, for if you fail, at least you can reach the clouds..

GeGnome
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Joined: Thu Feb 12, 2009 7:34 am

### Re: homework help!!!

Hardy-Weinberg Equilibrium: P^2 + 2pq + q^2 = 1; p + q = 1

Frequency of those who can taste PTC: 70% = 0.7
Frequency of those who can't taste PTC: 30% = 0.3

T = p
t = q

tt = 0.3 = p^2
p = 0.3^(1/2)
q = 1 - p
This was derived from p + q = 1

Frequency of those with a "T" = q
Frequency of those with a "t" = p

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