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(C) dihybrid test cross involves crossing an $F_1$ dihybrid (e.g.,$TtRr$) with a homozygous recessive parent (e.g.,$ttrr$).The gametes produced by the

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$1 : 1 : 1 : 1$

Vedclass · Answer

(C) dihybrid test cross involves crossing an $F_1$ dihybrid (e.g.,$TtRr$) with a homozygous recessive parent (e.g.,$ttrr$).The gametes produced by the dihybrid $(TtRr)$ are $TR, Tr, tR,$ and $tr$,while the homozygous recessive parent $(ttrr)$ produces only $tr$ gametes.The resulting offspring genotypes are:$TtRr$ (Tall,Round)$Ttrr$ (Tall,Wrinkled)$ttRr$ (Dwarf,Round)$ttrr$ (Dwarf,Wrinkled)Since each genotype appears in equal frequency,the phenotypic ratio is $1 : 1 : 1 : 1$.

$A$ dihybrid for qualitative traits is crossed with a homozygous recessive individual of its type. The phenotypic ratio is:

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