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NEET UG BIOLOGY MCQ: PRINCIPLE OF INHERITANCE AND VARIATION

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Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, then

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-segregation will show

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Correct option: C

9\mathrm{ }:\mathrm{ }3\mathrm{ }:\mathrm{ }3\mathrm{ }:\mathrm{ }1

Option C (

9\mathrm{ }:\mathrm{ }3\mathrm{ }:\mathrm{ }3\mathrm{ }:\mathrm{ }1

) is correct because even though the genes are linked, some crossing over will still occur, leading to a modified dihybrid ratio that approximates 9:3:3:1, especially if the genes are not extremely tightly linked.

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\mathrm{X}

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{F_1}

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{F_1}

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