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(D) test cross is performed to determine the genotype of an organism by crossing it with a homozygous recessive parent.For a trihybrid organism (genot

Vedclass · Accepted Answer

$1:1:1:1:1:1:1:1$

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(D) test cross is performed to determine the genotype of an organism by crossing it with a homozygous recessive parent.For a trihybrid organism (genotype $AaBbCc$),the gametes produced are $ABC, ABc, AbC, Abc, aBC, aBc, abC, abc$ (total $8$ types).The homozygous recessive parent (genotype $aabbcc$) produces only one type of gamete: $abc$.When these are crossed,the resulting offspring will have $8$ different genotypes and phenotypes in a ratio of $1:1:1:1:1:1:1:1$ ($2^3 = 8$ combinations).Therefore,the phenotypic ratio is $1:1:1:1:1:1:1:1$.

What should be the phenotypic ratio of a test cross between a trihybrid and a homozygous recessive parent?

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