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How many types of genotypes of $F_{2}$ progeny of Mendelian dihybrid cross are neither seen in $F_{1}$ generation nor in parental generation of the cross?

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Four

Six

Five

Three

answer is B.

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Detailed Solution

The genotypes of $F_{2}$ generation seen neither in P generation nor in $F_{1}$ generation are Rr YY, RR Yy, RR yy, rr YY, rrYy and Rr yy. The genotype RrYy is seen in $F_{1}$ and RRYY and rryy are seen in Parental generation.

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