In a chromosome map of maize,two genes R and | vedclass

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(D) When two genes are located very close to each other on the same chromosome,they exhibit the phenomenon of linkage. Linkage reduces the frequency o

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Higher number of parental types

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(D) When two genes are located very close to each other on the same chromosome,they exhibit the phenomenon of linkage. Linkage reduces the frequency of crossing over between the genes. As a result,the genes tend to be inherited together,leading to a higher frequency of parental combinations in the offspring compared to the recombinant combinations. Therefore,in the $F_2$ generation,the parental types will be significantly higher than the recombinant types,deviating from the independent assortment ratio of $9:3:3:1$.

In a chromosome map of maize,two genes $R$ and $Y$ are located very close to each other. When $RRYY$ and $rryy$ genotypes are crossed,the $F_2$ generation analysis shows:

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