Polygenic inheritance

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Presentation transcript:

Polygenic inheritance

Definition Polygeny is when a single characteristic may be controlled by more than one gene. Several genes control the expression of the same character

These types of phenotype exhibit continuous variation in a population. Eg skin colour, height

Skin colour 5 possible phenotypes 9 genotypes Melanin production is controlled by 2 genes The amount is directly proportional to the number of dominant alleles

White - 0 Light - 1 Medium – 2 Dark – 3 Black – 4 Complete the punnett square for a heterozygous cross writing in the genotype and phenotype.

Activities Determine the phenotypes of the offspring for the following: A mating of white with black A mating between two individuals of medium skin colour If 5 phenotypes are possible for two genes, how many are possible for three (eg A, B and C)

What is the difference between continuous and discontinuous variation?