2. Next, use the Hardy-Weinberg equation (p + 2pg + g = 1) to calculate the expected frequencies of genotypes c°c, c°c, and c'c for a population in Hardy-Weinberg equilibrium.

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
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Chapter19: Population Genetics And Human Evolution
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Please Answer problem number 2

Next, use the Hardy-Weinberg equation (p2 + 2pq + q2 = 1) to calculate the expected frequencies of genotypes CGCG , CGCY , and CYCY for a population in Hardy-Weinberg equilibrium.

One way to test whether evolution is occurring in a population is to compare
the observed genotype frequencies at a locus with those expected for a
non-evolving population based on the Hardy-Weinberg equation. In this
exercise, you'l test whether a pea plant population is evolving at a locus
with two alleles, C and C, that affect chlorophyll production and hence leaf
color.
Experimental Set-up:
Students planted soybean seeds and then counted the number of seedlings
of each genotype at Day 7 and again at Day 21. Seedlings of eadch genotype
could be distinguished visually because the C and C' show incomplete
dominance: Cc seedlings have green leaves, CC seedlings have
green-yellow leaves, and C'C' seedlings have yellow leaves.
Number of Seediings
Time (Days)
Green
Green-Yellow
Yellow
Total
52
113
222
21
49
22
179
Interpret the Data
1. Use the observed genotype frequencies from Day 7 data to calculate
the frequencies of the C" allele (p) and the C' allele (4). (Remember
that the frequency of an allele in a gene pool is the number of copies
of that allele divided by the total number of copies of all alleles at that
locus.)
Tatal number of alleles are: 222 x2 = 444
The number of C alleles are: CCx 2+ C°C
= 52 x 2+ 113
= 104 + 113
= 217
The allelic frequency is calculated at 7th day.
The formula for calculating allelic frequency of C° (p) is: Number of A alleles Total
number of alleles
= 217/444
= 0.488
-0.49
The allelic frequency of C" (4) is 1- C= 1-0.49- 0.51
2. Next, use the Hardy-Weinberg equation (p + 2pg + q = 1) to
calculate the expected frequencies of genotypes c°c, c°c", and c'c"
for a population in Hardy-Weinberg equilibrium.
Transcribed Image Text:One way to test whether evolution is occurring in a population is to compare the observed genotype frequencies at a locus with those expected for a non-evolving population based on the Hardy-Weinberg equation. In this exercise, you'l test whether a pea plant population is evolving at a locus with two alleles, C and C, that affect chlorophyll production and hence leaf color. Experimental Set-up: Students planted soybean seeds and then counted the number of seedlings of each genotype at Day 7 and again at Day 21. Seedlings of eadch genotype could be distinguished visually because the C and C' show incomplete dominance: Cc seedlings have green leaves, CC seedlings have green-yellow leaves, and C'C' seedlings have yellow leaves. Number of Seediings Time (Days) Green Green-Yellow Yellow Total 52 113 222 21 49 22 179 Interpret the Data 1. Use the observed genotype frequencies from Day 7 data to calculate the frequencies of the C" allele (p) and the C' allele (4). (Remember that the frequency of an allele in a gene pool is the number of copies of that allele divided by the total number of copies of all alleles at that locus.) Tatal number of alleles are: 222 x2 = 444 The number of C alleles are: CCx 2+ C°C = 52 x 2+ 113 = 104 + 113 = 217 The allelic frequency is calculated at 7th day. The formula for calculating allelic frequency of C° (p) is: Number of A alleles Total number of alleles = 217/444 = 0.488 -0.49 The allelic frequency of C" (4) is 1- C= 1-0.49- 0.51 2. Next, use the Hardy-Weinberg equation (p + 2pg + q = 1) to calculate the expected frequencies of genotypes c°c, c°c", and c'c" for a population in Hardy-Weinberg equilibrium.
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