01:119:115 Lecture Notes - Lecture 20: Allele Frequency, Foot, Gene Pool

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: Stern Cardinale

Document Summary

Alleles are not altered by inheritance alone. Allele frequencies in the gene pool stay constant until altered by an outside force. Microevolution= shifts in allele in frequencies over generations, small gradual changes. Macroevolution= large-scale changes results in changes that are large enough to place as different taxonomic groups. Natu(cid:396)al sele(cid:272)tio(cid:374) does(cid:374)"t (cid:272)(cid:396)eate (cid:374)e(cid:449) t(cid:396)aits, (cid:271)ut edits o(cid:396) sele(cid:272)ts fo(cid:396) t(cid:396)aits al(cid:396)eady p(cid:396)ese(cid:374)t i(cid:374) the population genome: local environment determines which traits will be selected for or selected against in any specific population. I(cid:374)di(cid:448)iduals do(cid:374)"t e(cid:448)ol(cid:448)e; populatio(cid:374)s e(cid:448)ol(cid:448)e o(cid:448)e(cid:396) ti(cid:373)e: natural selection can only increase or decrease heritable traits in a population. Evolution: change in a population over generations. Microevolutions: a change in allele frequencies in a population over generations. Variation: phenotypes, mendelian traits: some phenotypes are either on or off, gradations: vary along a continuum. (2+ genes influence character, genetic, drift: among individuals or sequences. 1 of 2 or more alternate versions of a gene.