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(C) dihybrid test cross involves crossing an $F_1$ dihybrid individual (genotype $AaBb$) with a homozygous recessive individual (genotype $aabb$).In t

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$1 : 1 : 1 : 1$

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(C) dihybrid test cross involves crossing an $F_1$ dihybrid individual (genotype $AaBb$) with a homozygous recessive individual (genotype $aabb$).In this cross,the $F_1$ individual produces four types of gametes: $AB$,$Ab$,$aB$,and $ab$.The homozygous recessive parent produces only one type of gamete: $ab$.When these gametes combine,the resulting offspring genotypes are $AaBb$,$Aabb$,$aaBb$,and $aabb$.Each of these genotypes corresponds to a distinct phenotype in a $1:1:1:1$ ratio.

In Mendel's dihybrid cross experiment,what is the phenotypic ratio of the progeny obtained from a test cross of the $F_1$ generation?

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