You are studying a population of parrots. The parrots are generally either whist
ID: 178319 • Letter: Y
Question
You are studying a population of parrots. The parrots are generally either whistlers, squawkers or are able to do both with this trait controlled by a gene at a single locus. Parrots with WW genotype are whistlers. Those with ww are squawkers and those with Ww are able to make both sounds. You assume that the parrots are in Hardy-Weinberg equilibrium. You take a survey of the parrots and find the following numbers whistlers: 4900 squawkers: 900 both: 4200
a) Calculate the genotype and allelic frequencies in this population of parrots.
b) The population of parrots you are studying is becoming popular in the pet trade and are being trapped by poachers. Whistling parrots are the most desirable and so are being lost from the population in the greatest numbers.
One year after poaching began you find the following numbers of parrots: whistlers: 500 squawkers: 3000 both: 4000 What are the genotype and allelic frequencies in your population of parrots in this year after poaching begins?
c) What is the absolute fitness of each genotype?
d) What is the relative fitness of each genotype?
e) What allelic frequencies would you expect following another year of poaching? Include your calculation of mean fitness.
Explanation / Answer
WW (whistlers): 4900
ww (squawkers): 900
Ww (both sounds): 4200
Total population= 10,000
Total alleles= 10,000x2=20,000
Allelic frequency:
p=f(W)= 4900x2 + 4200/ 20,000= 0.7
q=f(w)= 900 x 2 + 4200 / 20,000= 0.3
Genotypic frequency:
f(WW)= 4900/10,000=0.49
f(ww)= 900/10,000=0.09
f(Ww)= 4200/10,000=0.42
AFTER POACHING
WW (whistlers): 500
ww (squawkers): 3000
Ww (both sounds): 4000
Total population= 75,00
Total alleles= 75,00 x 2=15,000
Allelic frequency after poaching:
p=f(W)= 500 x 2 + 4000/ 20,000= 0.25
q=f(w)= 3000 x 2 + 4000 / 20,000= 0.50
Genotypic frequency after poaching:
f(WW)= 500/10,000=0.05
f(ww)= 3000/10,000=0.3
f(Ww)= 4000/10,000=0.4
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