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5. Non-Random Mating. Imagine a population of witch hazel plants (Hamamelis virginiana) that
is polymorphic at the " B " locus with two alleles, B and b . You determined the B-locus
genotypes of 2500 randomly-sampled individuals and compared observed genotype frequencies
to Hardy-Weinberg expectations. The results were: Witch hazel flowers tend to bloom very late
in the growing season, typically between midOctober and mid-November, when most animal
pollinators are inactive. Based on this observation, you came up with two hypotheses for how
witch-hazel flowers reproduce. - Hypothesis 1: Witch hazel plants often use their own pollen to
create their seeds (= self-pollination or "selfing", an extreme form of inbreeding) - Hypothesis 2:
Witch hazel flowers are incapable of self-fertilization, and are pollinated when the wind carries
pollen from one individual to another (outcrossing) Do the genotype frequencies in your sample
support hypothesis 1 or hypothesis 2 ? Briefly explain your answer (4 pts.)

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5- Non-Random Mating- Imagine a population of witch hazel plants (Hama.docx

  • 1. 5. Non-Random Mating. Imagine a population of witch hazel plants (Hamamelis virginiana) that is polymorphic at the " B " locus with two alleles, B and b . You determined the B-locus genotypes of 2500 randomly-sampled individuals and compared observed genotype frequencies to Hardy-Weinberg expectations. The results were: Witch hazel flowers tend to bloom very late in the growing season, typically between midOctober and mid-November, when most animal pollinators are inactive. Based on this observation, you came up with two hypotheses for how witch-hazel flowers reproduce. - Hypothesis 1: Witch hazel plants often use their own pollen to create their seeds (= self-pollination or "selfing", an extreme form of inbreeding) - Hypothesis 2: Witch hazel flowers are incapable of self-fertilization, and are pollinated when the wind carries pollen from one individual to another (outcrossing) Do the genotype frequencies in your sample support hypothesis 1 or hypothesis 2 ? Briefly explain your answer (4 pts.)