In polygenic inheritance, a trait is controlled by two pairs of genes. Two individuals which are heterozygous for both genes, crossed each other, such type of cross produces what phenotypic ratio ?

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Solution

Polygenic inheritance: count the number of total dominant allele
As the number of total dominant allele would determine the type of phenotype.

In dihybrid cross, you will get total 1 : 4 : 6 : 4 : 1 phenotypes

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1 : 6 : x : 20 : x : 6 : 1

x

	Column I		Column II
A.	A single trait controlled by three or more than three alleles	(i)	Pleiotropy
B.	A single trait controlled by three or more than three genes	(ii)	Multiple alleles
C.	A single gene exhibits multiple phenotypic expression	(iii)	Polygenic inheritance

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