Anthropology 1020E Lecture Notes - Reproductive Isolation, Microevolution, Punctuated Equilibrium

• School: Western University
• Department: Anthropology
• Course: Anthropology 1020E
• Professor: Alexis Dolphin

Document Summary

How physical traits could be expressed in plant hybrids: simple monogenetic traits (one gene, experiments with pea plants published 1866, crossing tall pea plants and short pea plants. Found blending theory (thought that medium size) not true. He found that when crossing some short and some tall: he was able to systemically approach the problem like darwin. Came up with two principles: principle of segregation: Genes come in different version (alleles) that have different effects ( there can be different outcomes) Each parent has 2 alleles for a trait (one on each chromosome, at the same locus) Offspring gets only 1 allele from each parent. Codominant-both alleles expressed: principle of independent assortment. Distribution of pair of alleles into gametes does not influence the distribution of another pair. Genes controlling different traits are inherited independently of another. Genotype- combinations of 2 alleles that code for a trait, genetic makeup: tt or tt.