Inheritance160-page16

Inheritance160-page16 - Inheritance of Eye Color in Humans...

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Inheritance Patterns - 16 Interactions Involving More Than One Gene Polygenic Inheritance The traits that we have so far discussed all have phenotypes resulting from the interaction of the alleles of one gene. Two or more genes can interact to produce a greater numbers of phenotypes. When two or more genes interact in ways that result in a number of different phenotypes, we see more variation in the population, with respect to that genetic characteristic. We call this type of inheritance polygenic inheritance. The individual phenotype is the result of the combined interaction of all the alleles at all of the gene loci involved.
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Unformatted text preview: Inheritance of Eye Color in Humans Human eye color involves the polygenic inheritance of at least two genes, each of which lacks dominance. The eye color genes code for the production of a yellow-brown pigment First Iris Layer Pigment Second Iris Layer Pigment AA = Produce lots of pigment BB = Produce lots of pigment Aa = Produce some pigment Bb = Produce some pigment aa = Do not produce pigment bb = Do not produce pigment *There is also a yellow overlay gene which, when combined with the basic pigment gene alters light brown to hazel and light blue to green....
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