BIOL 303 Lecture 18: Chapter 7: Investigating Multifactorial Traits 2
10 Mar 2017
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Document Summary
Cleft lip is more likely in a person who has relatively with the condition. The more related they are, the more problems they all share. Estimates the proportion of the phenotypic variation in a population due to genetic differences. The proportion of the phenotypic variance due to total genetic variance is called. Varies from o (all variance is from environment) to 1 (all variance is genetic) Researcher use several statistical methods to estimate heritability. One way is to compare the proportion of people sharing a trait to the proportion predicted to share the trait. Expected proportion is derived by knowing the blood relationships of the individuals. The closer the relationship, the more alleles they have together. Similarities between adopted people and adopted parents reflect mostly environmental influences. Similarities between adoptees and their biological parents reflect mostly genetic influences. Information on both sets of parents can reveal how heredity and the environment both contribute to a trait.
