Answer Happy

The allele frequencies for three different populations of
Drosophila are determined for a C/G SNP. The three populations are
then mixed in the proportions shown below.
Number in mixed population
f(C)
f(G)
Population #1
3000
0.25
0.75
Population #2
6000
0.3
0.7
Population #3
9000
0.4
0.6
What are the new values of f(C) and f(G) in the mixed
population? Show your calculations. What number of CC and
GG flies would be expected in the mixed population (total number of
homozygous flies)?
It was expected that the Drosophila would mate randomly (return
to H-W Eq) after the populations mix, but this was not observed.
Instead the Drosophila from each population only mated with
individuals from their original population. Would there be more or
less, and how many, CC and GG homozygous flies combined (total
number of homozygous flies) compared to random mating?
Set up a Chi Square with 1 df (homozygous and heterozygous are
the two categories) for population structure (observed) vs. random
mating (expected). State the null hypothesis, show your
calculations and interpret the Chi-Square value.