Calculate the observed frequencies of genotypes C"C* , C°C, and C'C' at Day 7. (The observed frequency of a genotype in a gene pool is the number of individuals with that genotype divided by the total number of individuals. Compare these frequencies to the expected frequencies calculated in Step 2. Is the seedling population in Hardy-Weinberg equilibrium at Day 7, or is evolution occurring? Explain your reasoning and identify which genotypes, if any, appear to be selected for or against.

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
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Author:Michael Cummings
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Chapter19: Population Genetics And Human Evolution
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Problem 10QP
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ANSWER THE PROBLEM 3 PLEASE

Determining if a plant population is Evolving
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'll test whether a pea plant population is evolving at a locus with two
alleles, Cand 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 each genotype
could be distinguished visually because the C° and C' show incomplete
dominance: C°C seedlings have green leaves, C°C" seedlings have green-
yellow leaves, and C'C' seedlings have yellow leaves.
Number of Seedlings
Time (Days)
Green-Yellow
Yellow
Total
Green
c"c
c'c"
7
52
113
58
222
21
49
108
22
179
Interpret the Data
Transcribed Image Text:Determining if a plant population is Evolving 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'll test whether a pea plant population is evolving at a locus with two alleles, Cand 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 each genotype could be distinguished visually because the C° and C' show incomplete dominance: C°C seedlings have green leaves, C°C" seedlings have green- yellow leaves, and C'C' seedlings have yellow leaves. Number of Seedlings Time (Days) Green-Yellow Yellow Total Green c"c c'c" 7 52 113 58 222 21 49 108 22 179 Interpret the Data
3. Calculate the observed frequencies of genotypes C"C, C°C", and
C'C' at Day 7. (The observed frequency of a genotype in a gene pool is
the number of individuals with that genotype divided by the total
number of individuals.
Compare these frequencies to the expected frequencies calculated in
Step 2. Is the seedling population in Hardy-Weinberg equilibrium at
Day 7, or is evolution occurring?
Explain your reasoning and identify which genotypes, if any, appear
to be selected for or against.
Transcribed Image Text:3. Calculate the observed frequencies of genotypes C"C, C°C", and C'C' at Day 7. (The observed frequency of a genotype in a gene pool is the number of individuals with that genotype divided by the total number of individuals. Compare these frequencies to the expected frequencies calculated in Step 2. Is the seedling population in Hardy-Weinberg equilibrium at Day 7, or is evolution occurring? Explain your reasoning and identify which genotypes, if any, appear to be selected for or against.
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