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  4. A cross was carried out between two individuals heterozygous for two pairs of genes was carried out. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be

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Q. A cross was carried out between two individuals heterozygous for two pairs of genes was carried out. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be

KVPYKVPY 2018

Solution:

In the given question, both parents are heterozygous for two pairs of genes. This means the cross is a dihybrid cross.
Lets assume a dihybrid cross
image
image
The genotypic ratio i s l : 2 : l : 2 : 4 : 2 : l : 2 : 1 The phenotypic ratio is 9 : 3 : 3 : 1
$\therefore $ The number of different genotypes and phenotypes obtained would be 9 and 4, respectively.