BIO 200LLB Lecture Notes - Lecture 16: Parasitism, Polygene, Achondroplasia

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200LLB
• Professor: Herreid, C F

Document Summary

Artificial selection= genetic changes within a population which occur because human beings intentionally select for certain characteristics either by choosing which organisms to breed or eliminating undesirable individuals. Natural selection= genetic changes within a natural (wild) population which occur because of differences in the reproductive success of some individuals over other individuals. In order for evolution to occur there must be variation in the population. Wild mustard= kale, cabbage, broccoli, cauliflower, kohlrabi, brussels sprout. Mtdna indicates all dogs are derived from a species of wolf about 10,000. The romans (2,000 years ago had only 6 breeds) Some foxes were nasty so they bred ones that were gentle to get milder foxes over time. The tail became shorter and curled, the ears became floppy, and the colour varied. Pleiotropy= one gene affects the other traits. Differences in mortality and reproduction lead to differences in the proportion of alleles passing to the next generation.