There is a natural, isolated population of hummingbirds in a valley in Ecuador.
ID: 177579 • Letter: T
Question
There is a natural, isolated population of hummingbirds in a valley in Ecuador. The population is very large and there is no apparent gene flow in or out. Wing lenght is contorlled by a single locus with two alleles: T and t. There is incomplete dominace, meaning that heterozygotes have medium-sized wings, indicated below. The frequency of T is 0.4. The number of individuals with each phenotype is also indicated. Given the data below, what might be happening in this population? Show whether or not this population is in Hardy-Weinberg Equilibrium. If it's not, what reasonable bilogical effect(s) could you make to expalin this patttern?
TT-tiny wings-3900
Tt-medium wings-5000
tt-longwings-1100
Explanation / Answer
Answer:
The frequency of T = 0.4
The frequencu of t = 0.6 (as p+q=1)
The expected frequency of TT = 0. 4 * 0.4 = 0.16
The expected TT population = 0.16 * 10000 = 1600
The expected tt population = 0.36 * 10000 = 3600
The expected Tt population = 2 * 0.4 * 0.6 * 10000 = 4800
The obeved population and expected population according to Hardy-Weinberg equilibrium are not similar. So the population is not in Hardy-Weinberg equilibrium.
As the inheritance pattern is incompleted dominance, so both the alleles must have same frequency. Due to the difference in the frequencies of the alleles (mentioned in the statement), the population is not in Hardy-Weinberg equilibrium.
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