You are studying an endangered flower growing in the Superior National Forest. T
ID: 254202 • Letter: Y
Question
You are studying an endangered flower growing in the Superior National Forest. These flowers are sexually reproducing and freely-interbreeding. They are tall, medium or short. The height is determined by one gene with two alleles that are incompletely dominant.
Genotype Phenotype
HH tall
Hh medium
hh short
Last year, you counted all the flowers in your sample plots and got the following results:
Height Number
Tall 2
Medium 36
Short 162
a) What are the frequencies of the two alleles (H and h) in this population?
b) Is the height gene in this population evolving? How do you know?
This year, after a particularly harsh winter, you count all the flowers in your plots in the forest again and get the following results:
Height Number
Tall 4
Medium 60
Short 36
c)What are the frequencies of the two alleles (H and h) in this population?
d) Is the height gene in this population evolving? How do you know?
e)Assume that the changes in the population of flowers from last year to this year are due to natural selection. What is a reasonable hypothesis to explain these changes?
Explanation / Answer
a) Allele frequency of H is 2.75% (4+18/8)
Allele frequency of h is 42.75(324+18/8)
b) Height gene is not evolving because frequency of h gene(short plant) is high.
c)Allele frequency of H is 19%(8+30/2)
Allele frequency of h is 51%(72+30/2)
d &e) Allele frequency of H has been increased more in coparision of h allele second time which shows that H allele is being selected by nature.
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