[Campbell Biology P.326] In a monohybrid cross between two F1 heterozygotes Rr , what is the... | Practice Question

In a monohybrid cross between two F1 heterozygotes Rr , what is the probability of an F2 offspring having the genotype RR?

  • A: 1/2
  • B: 1/4
  • C: 3/4
  • D: 1

Explanation

The probability of an egg carrying the R allele is 1/2, and the probability of a sperm carrying the R allele is 1/2. Using the multiplication rule for independent events, the probability of an RR offspring is 1/2 1/2 = 1/4.