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What are the sources of variation that makes members of the same species different from each other?
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- Hybridization between incompletely isolated populationsa. always leads to reinforcement due to the inferiority of hybrids.b. can serve as a mechanism for preserving gene flowbetween populations, thus preventing speciation.c. occurs only in plants.d. never affects rates of speciation.
- Suppose 64% of a remote mountain village can taste phenylthiocarbamide (PTC) and must therefore have at least one copy of the dominant PTC taster allele. If this population conforms to Hardy-Weinberg expectations for this gene, what percentage of the population must be heterozygous for this trait?
- 1. Happen very slowly2. Alone are not responsible for selection pressure3. Add new alleles every generation 4. Tend to work in opposite direction of selection