• Polygenic (“many genes”) traits – controlled by more 2 or more genes. This is the case for most traits! – produce a wide range of phenotypes . • Ex: Skin color • Evidence indicates that skin color in humans is controlled by 3 genes – each of which have a dominant allele and a recessive allele. We represent the 3 genes as A, B and C, take a look at the example:
Polygenic (“many genes”) traits – controlled by more 2 or more genes. This is the case for most traits! – produce a wide range of phenotypes. Ex: Skin.
Jan 03, 2016
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• Polygenic (“many genes”) traits– controlled by more 2 or more genes. This is the
case for most traits!– produce a wide range of phenotypes. • Ex: Skin color• Evidence indicates that skin color in humans is
controlled by 3 genes – each of which have a dominant allele and a recessive allele. We represent the 3 genes as A, B and C, take a look at the example:
• this example shows 2 individuals who are heterozygous for all 3 genes and have an intermediate skin color are crossed.
• A Punnett square for this cross would produce 64 possibilities for the offspring.
• What statements can be made about this graph?
Gene interaction map
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