Frequencies in Gentics

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

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Frequencies in Gentics

Post by tom56elliott » Tue May 27, 2008 5:00 am

Question 1) A geneticist scores a population for two phenotypes, X and Y. X is produced by a dominant allele, Y is the double redessive genotype. He finds 156 Y and 203 X individuals. Assuming the population is in Hardy-Weinberg equilibrium, explain using a series of calcualtions the frequencies of the two allels. Be able to show and explain your working.

Queston 2) A trait is affected by three alleles, A1, A2 and A3 which are co-dominant. The following genotype frequencies were scored in the population.

A1A1:80 , A1A2:70 , A2A2:10 , A2A3:6 , A3A3:15 , A1A3:19.

i) Explain the frequencies of the the three alleles (A1, A2 and A3) Use symbols 'p', and 'q' and 'r' for the three frequencies.
ii) Explain the expected genotypic ratios and determine if the population is in Hardy-Weinberg equilibrium?

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Post by mith » Tue May 27, 2008 5:08 am

Sure would be helpful if I had paid attention in class
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Post by daniel.kurz » Tue May 27, 2008 6:54 pm

Time to go look up Hardy Wineberg equilibrium online. I don't do people's homework, sorry.

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