In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
1. The alleles of two genes are interacting with each other
2. It is a multigenic inheritance
3. It is a case of multiple allelism
4. The alleles of two genes are segregating independently.
Subtopic:  Dihybrid Cross Analysis |
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In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are:
1. phenotypes - 4; genotypes - 16
2. phenotypes - 9; genotypes - 4
3. phenotypes - 4; genotypes - 8
4. phenotypes - 4; genotypes - 9
Subtopic:  Dihybrid Cross Analysis |
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From NCERT
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