Biology 352
1. Hardy-Weinberg equilibrium (HWE) provides a quantitative basis for studying genetics in natural
populations. Which of the following is NOT a necessary assumption
2. Speciation can occur when different populations accumulate enough genetic differences that they
become unable to reproduce with one another. The evolutionary force called ________________ is
thought to greatly retard this process.
3. A single copy of a new allele appears in a population of orchids when pollen is transferred from a
distant population. The allele is neutral with respect to selection. There is a 1% probability of this
allele becoming fixed through the action of genetic drift. How many orchids are in the population?
(Assume that the size of the population is constant, and that this species of orchid is diploid.
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