Two genes R and Y are located very close on chromosomal linkage map of maize plant. When RRYY and rr

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4.Principles 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 $F_{2}$-segregation wii show

A

$1: 2: 1$

B

$3: 1$

C

$9: 3: 3: 1$

D

$1: 1: 1$

Solution

The genotypic ratio of monohybrid cross is $1: 2: 1$, whereas the phenotypic ratio is $3: 1$.

$9: 3: 3: 1$ is the phenotypic ratio of dihybrid cross (the cross made to study the inheritance of two pairs of factors or alleles of two genes).

Standard 12

Biology

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