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Lecture 11

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Biology (Sci)
BIOL 202
Mario Chevrette

Lecture 11 Quantitative Inheritance II 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). This leaves behind some degree of correlation. If the twins are not separated, the broadsense heritability would be overexpressed. Narrow sense heritability: h = Va/Vx. 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 +
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