BIO120H1 Chapter Notes - Chapter 7: Reproductive Isolation, Speciation, Chromosome

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Frederickson M. Wright S.

Document Summary

Bio120: why evolution is true, jerry a. coyne (ch. 7 the origin of. In association with reading quiz 5 and lecture 9. The concordance between two cultural groups with very different backgrounds should convince us that the discontinuities of nature are not arbitrary, but an objective fact. Each individual almost always falls into one of many discrete group. Although there"s variation among individuals within a cluster, the clusters nevertheless remain discrete in organism space. ; where the clusters are evident in all organisms that reproduce sexually discrete clusters are known as species. How these groups arise is the problem of speciation; the origin of species. Darwin didn"t think of the discontinuities of nature as a problem to be solved, or thought that these discontinuities would somehow be favoured by natural selection he couldn"t explain nature"s clusters in a coherent way. If speciation didn"t occur, there"d be no biodiversity at all only a single, long-evolved descendant of that very first species.