BIOLOGY 1114 Lecture 13: Selection and Fitness

• School: Ohio State University
• Department: Biology
• Course: BIOLOGY 1114
• Professor: James Chiucchi

Document Summary

Recap: appearance or performance of individual is product of genotype & environment, gene-level variability is generated through random processes, environment in which one lives is variable and limiting with respect to resources & competition. Selection: nonrandom, differential survival and reproduction of particular phenotypes, examples: darwin"s finches & beak size, environment affected which beak size became more prominent, result of heritable variation. Biological fitness: the ability of an individual to produce surviving, fertile offspring relative to that ability in other individuals in the population, measure by number of babies. Adaptation: a heritable trait that increases a(cid:374) i(cid:374)dividual"s fit(cid:374)ess i(cid:374) a particular e(cid:374)viro(cid:374)(cid:373)e(cid:374)t relative to individuals lacking this trait. Increase mortality across the population: density dependent factors. Increase mortality based on population size: both limit the natural, genetically determined _____________, genotype governs r, it has consequences for competitive ability and determines what kinds of responses fight competition, affects: Fecundity: number of gametes per individual: viability, mating success, gamete viability.