Dihybrid Cross Video Lessons

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Problem: In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the recessive allele; for example, R– means the individual has either the genotype RR or Rr. In Duroc-Jersey pigs, genotypes R–S– have a red coat color, R–ss and rrS– have sandy-colored coats, and rrss pigs are white. R and S show independent assortment. What is the ratio of red : sandy : white among progeny of the cross RrSs × RrSs?A) 9:6:1B) 10:3:3C) 12:3:1D) 9:3:1

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Given: RrSs × RrSs

Dihybrid Cross:

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Problem Details

In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the recessive allele; for example, R– means the individual has either the genotype RR or Rr. In Duroc-Jersey pigs, genotypes R–S– have a red coat color, R–ss and rrS– have sandy-colored coats, and rrss pigs are white. R and S show independent assortment. What is the ratio of red : sandy : white among progeny of the cross RrSs × RrSs?

A) 9:6:1

B) 10:3:3

C) 12:3:1

D) 9:3:1

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