4.
For foxes there exists a single gene that controls coat thickness.
Allele C confers a thick coat while allele c a thin coat. In a certain
population of 540 foxes, 49 have a thin coat. What are the allelic and
individual frequencies?
A. 49 thin coat/540 total = 0.09
q2 = 0.09, therefore the recessive
allelic frequency is q = 0.30
B. p + q = 1
p = 1 - 0.3
p = 0.7 - dominant allelic frequency
C.
| Genotype |
Designation |
Frequency |
Percent |
| Homozygous Dominant |
pp or p2 |
(0.7)2 = 0.49 |
49% |
| Heterozygote |
pq |
2(0.7)(0.3) = 0.42 |
42% |
| Homozygous Recessive |
qq |
(0.03)2 = 0.09 |
9% |
The dominant allelic frequency is
0.7 and the recessive allelic frequency is 0.3. The frequency of
homozygous dominants is 0.49, heterozygotes is 0.42 and homozygous recessive
is 0.09.
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