Principle of Inheritance and VariationMediumBloom L3
Question
Right handedness is dominant over left handedness. Most probable gene types with 2 right handed parents having left handed child is
Options
A.RR × rr
B.Rr × RR
C.RR × Rr
D.Rr × Rr
Solution
Sol.(d) [Key Concept: Monohybrid Cross — Heterozygous Parents] For two right-handed parents to produce a left-handed child (rr = homozygous recessive), BOTH parents must be heterozygous carriers (Rr). Cross Rr × Rr → 1/4 RR : 2/4 Rr : 1/4 rr = 3 right-handed : 1 left-handed. This 1/4 probability of a left-handed child (rr) is the expected Mendelian ratio. Any other combination (RR×rr, Rr×RR, RR×Rr) would not produce the observed 25% recessive offspring when parents show the dominant phenotype.
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