Review the section \"Investigating Life: Heredity and the Hungry Hordes.\" As In

Question

Review the section "Investigating Life: Heredity and the Hungry Hordes." As Indicated In the Image below, the dominant allele (R) confers susceptibility to the Bt toxin, and a recessive allele (r) confers resistance to Bt. Suppose that a susceptible male mates with a resistant female. They have many offspring, a few of which are resistant to Bt. What is the genotype of the male parent, and what is the genotype of the susceptible offspring? (Assume complete dominance.) The genotype of the male parent is Rr and the genotype of the susceptible offspring is Rr. The genotype of the male parent is either RR or Rr and the genotype of the susceptible offspring is Rr. The genotype of the male parent is Rr and the genotype of the susceptible offspring is either RR or Rr. The genotype of the male parent is either RR or Rr and the genotype of the susceptible offspring is either RR or Rr. The genotype of the male parent is RR and the genotype of the susceptible offspring is Rr.

Explanation / Answer

Since resistant ones have "rr" genotype, and few offspring are resistant, thus the male fly will contribute one "r" allele and female will contribute one "r' allele. Thus genotype of male parent will be "Rr". On crossing(Rr×rr) we get : Rr, rr offspring. Rr is susceptible and rr is resistant. Hence correct option is (a).- genotype of male parent is Rr and that of susceptible offspring will be Rr.

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