This history question requires analysis of historical events, causes, and consequences. The detailed answer below provides context, evidence, and a well-structured explanation.

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AA: 360 (0.36), Aa: 480 (0.48), aa: 160 (0.16)
Hardy-Weinberg principle:
In a large randomly-mating population experiencing no evolutionary forces (no selection, mutation, migration, or genetic drift), allele frequencies ( for A, for a) and genotype frequencies ( for AA, for Aa, for aa) remain constant across generations.
Step 1: Calculate initial genotype numbers and frequencies (, , ).
Formula:
Substitute:
Frequencies: AA = , Aa = , aa = .
AA: 360 (0.36), Aa: 480 (0.48), aa: 160 (0.16)
Step 2: New allele frequencies after 100 Aa die before reproducing.
Survivors:
Total survivors .
Total alleles = .
A alleles: .
p' = \frac{11{18} \approx 0.611, \quad q' = \frac{7}{18} \approx 0.389}
Step 3: Expected genotype frequencies after random mating (, ).
Formula:
Substitute and simplify:
AA: \frac{121{324} \approx 0.373, \quad Aa: \frac{77}{162} \approx 0.475, \quad aa: \frac{49}{324} \approx 0.151}
Step 4: Is the population in Hardy-Weinberg equilibrium after selection (before mating)?
Genotype frequencies after selection:
AA: , Aa: , aa: .
Expected under HWE (using ): AA , Aa , aa .
Observed expected, so not in H-W equilibrium (selection disrupted genotype frequencies). After random mating, next generation will be in HWE.
No (selection changed genotype frequencies; random mating restores HWE next generation)
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Hardy-Weinberg principle: In a large randomly-mating population experiencing no evolutionary forces (no selection, mutation, migration, or genetic drift), allele frequencies (p for A, q = 1 - p for a) and genotype frequencies (p^2 for AA, 2pq for Aa,…
This history question requires analysis of historical events, causes, and consequences. The detailed answer below provides context, evidence, and a well-structured explanation.