1-23 population genetics- selection

1-23 population genetics- selection - POPU LAT ION GENET...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: POPU LAT ION GENET ICS: SELECT ION LIFE 22.3 | Klug 624-628 22.3 What evolutionary mechanisms result in adaptation?- adaptation occurs when some individuals in a population contribute more offspring to the next generation than others allele frequencies in the population change in a way that adapts individuals to the environment that influenced such reproductive success = natural selection-natural selection acts on the phenotype rather than on the genotype- reproductive contribution of a phenotype to subsequent generations relative to the contributions of other phenotypes is called its fitness .-the fitness of a phenotype is determined by the average rates of survival and reproduction of individuals with that phenotype 22.3.1 Natural Selection produces variable results-characters influenced by alleles at more than one locus are more likely to show quantitative rather than qualitative variation-quantitative variation has both genetic and environmental factors-natural selection can act on characters of quantitative variation: • Stabilizing selection preserves the average characteristics of a...
View Full Document

{[ snackBarMessage ]}

Page1 / 3

1-23 population genetics- selection - POPU LAT ION GENET...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online