BIO 1130 Lecture Notes - Lecture 14: Sahelanthropus, Assortative Mating, Human Skin Color

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Marc Charette

Document Summary

7. 1 inter-population genetic variation: one species, two populations of caribou: the individuals of each population have a tendency to mate with members of their own population. (positive mating assortative mating) Interbreeding between the 2 herds: 2 populations in one species. Polymorphic species: species formed several geographic groups which differ from each other by traits that are easy to recognize (sometimes called morphs, forms or subspecies). 7. 3 adaptive value of geographical variation: ecogeographic rules: models of geographical variation that follows climatic gradients for many species within a group of vertebrates. In birds and mammals the northern populations or species will generally have short and massive extremities whereas the southern populations (species)will have longer and thinner extremities. In endothermic animals in general, the populations living in northern regions of geographic distribution of the species will generally have a larger size: (cid:1011)2% of (cid:271)irds a(cid:374)d (cid:1010)(cid:1009)% of (cid:373)a(cid:373)(cid:373)als follo(cid:449) berg(cid:373)a(cid:374)(cid:374)"s rules.