BIOL 202 Lecture Notes - Lecture 11: Covariance, Heritability
25 Feb 2013
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Document Summary
Only heritable traits are capable of being selected. In humans, heritability is tested from twins that were separated at birth. Sometimes correlation is equal to heritability (read 19. 3). However, no complete separation is possible (they shared the uterus). If the twins are not separated, the broadsense heritability would be overexpressed. Instead of the value of the genotype, the va stands for the additive values of the genes. This additive value stands for the most important traits in the line of traits that are being examined. Genes can be combined, which could influence how selection occurs. Example, without dominance, a loci could range from 1 to 3 flowers, and thus the mean would be 2, (1,2,3,). With dominance, the range is the same, from 1 to 3, but the mean would be 2. 5, since the 3 possible results would be 1,3,3. Vx = vg + ve, vx = va + vd + ve.
