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Home Q & A Board Science-Related Homework Help High School Level Science
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boojis boojis
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11 years ago
In a randomnly mating population of drosophila, 4% of the flies have black bodiesan autosomal recessive trait) and 96% have brown bodies. This population is assumed to be in heidy weinberg equilibrium.

1.What is the frequency of the dominant allele for a population of 10 000 drosophila?
a. 0.8
b. 0.4
c.0.96
d.0.2

2. If a researcher samples 10000 drosophila from this population, the number of flies expected to be homozygous dominant for body color is?
a. 400
b.3200
c.6400
d.9600
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wrote...
#1
Educator
11 years ago
This has been asked before...

Let us know if this helps:

https://biology-forums.com/index.php?topic=22986.0
boojis Author
wrote...
#2
11 years ago
it didnt help me with the second question
wrote...
#3
11 years ago
Try labeling q as the black recessive trait, and p as the brown one. Using p^2 + 2pq +q^2, you can find the genotype frequency by plugging in your allelic frequencies that you get from the 4% and 96% that is given (these are observed genotype frequencies.)

So basically, find what is expected (VIA Hardy Weinburg) and then multiply the number you get from p^2 by 10,000.
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