BIO152H5 Lecture Notes - Lecture 16: Heterozygote Advantage, Mating Call, Balancing Selection
Document Summary
Etymology species is a latin word meaning kind or appearance . Sexual selection intrasexual selection is direct competition among individuals or one sex for mates of the opposite sex. Intersexual selection, often called mate choice, occurs when individuals of one sex (usually females) are choosy in mate selection. Male showiness due to mate choice, increases male"s chances of attracting a female, while decreasing his chances of survival. Inquiry: do females select mates based on traits indicative of good genes ? female grey tree frogs prefer long mating calls the duration of a male"s mating call is indicative of that male"s overall genetic quality figure 23. 15. Diploidy maintains genetic variation in the form of recessive alleles hidden from selection in heterozygotes. Balancing selection occurs when natural selection maintains stable frequencies of two more phenotypic forms in a population. Heterozygote advantage occurs when heterozygotes have a higher fitness than do both heterozygotes.
