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3 Black is dominant 3 Brown (chocolate lab) is recessive 3 Golden (yellow lab) is epistatic w/ recessive pigment alleles s Polygenic inheritance - One trait is affected by many genes
E.g. skin color Additive effect of 3 separately inherited genes on pigmentation in skin. Types of Variation
Genotypes, Phenotypes, and evolution
Polygenic inheritance e.g. height Polygenic inheritance e.g. height Note: males in dark; females in white Types of Variation
is usually complex:
x Environment - The phenotype is influenced by the s Relationship between genotype and phenotype environment
3 E.g. height, PKU 3 "Norm of Reaction" s Relationship between genotype and phenotype is usually complex x Genomic imprinting Types of Variation
s Relationship between genotype and phenotype can be complex:
x Development - Do identical twins have identical fingerprints? s Pedigree Chart- shows the pattern of in...
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This note was uploaded on 05/11/2010 for the course BIOLOGY 100 taught by Professor Richard during the Spring '10 term at George Mason.
- Spring '10