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The phenotypic ratio obtained when dominant allele of a gene is epistatic over the other gene is
Option: 1
9 : 6 : 1
Option: 2
12 : 3 : 1
Option: 3
13 : 3
Option: 4
15 : 1
Answers (1)
As discussed in Inhibitory gene action
In inhibitory gene action, a dominant allele at one locus can mask the expression of both (dominant and recessive) alleles at a second locus. This changes the phenotypic ratio of F2 to 13 : 3.
Hence, the correct answer is option (c).
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