homework help!!! - Biology Forum

last updated by

GeGnome 15 years, 9 months ago

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- February 11, 2009 at 2:43 am #10885
  westernbio129
  Participant
  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?
- February 11, 2009 at 4:55 pm #88989
  whizzbee
  Participant
  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
- February 12, 2009 at 7:46 am #89010
  GeGnome
  Participant
  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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