ENV100Y5 Chapter Notes - Chapter 3: Tads, Sexual Reproduction, Stabilizing Selection

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: N/ A

Document Summary

Golden tads were discovered in 1964 in monteverdi chile. Last observation in 1989, declared extinct in 2004 (iucn) Natural selection = traits that enhance survival and reproduction persist in population. If enough time passes you can get new species. Not all individuals will survive to reproduce. Parents pass traits on to offspring ( most of the offsprings don"t survive to reproduce) Adaptation= a trait that promotes reproduce success. Mutations = accidental changes in bna that may be passed on to offspring. Provide the genetic variation on which natural selection acts. Directional selection: drives a feature in one direction. Disruptive selection: traits diverge in two or more directions. Population = a group of individuals of a species that live in the same area. Doesn"t work on certain a sexual species. Allopathic speciation: species formation due to physical separation of populations. Grand crayon different kinds of squirrels on both sides of crayon. Sympatric speciation populations become reproductively isolated within the same area.