Grain colour in wheat is determined by three | vedclass

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(B) Grain colour in wheat is an example of polygenic inheritance involving $3$ gene pairs $(n = 3)$.In the $F_2$ generation of a trihybrid cross,the t

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Less than $5$ per cent

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(B) Grain colour in wheat is an example of polygenic inheritance involving $3$ gene pairs $(n = 3)$.In the $F_2$ generation of a trihybrid cross,the total number of possible combinations is $4^n = 4^3 = 64$.The parental phenotypes (extreme phenotypes) are represented by the genotypes $AABBCC$ (darkest) and $aabbcc$ (lightest).The proportion of individuals resembling either parent is given by the formula $(1/4)^n$.Substituting $n = 3$,we get $(1/4)^3 = 1/64$.Since $1/64$ is approximately $0.0156$,which is $1.56\%$,this value is less than $5\%$.

Grain colour in wheat is determined by three pairs of polygenes. Following the cross $AABBCC$ (dark colour) $\times$ $aabbcc$ (light colour),in $F_2$ generation,what proportion of the progeny is likely to resemble either parent?

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