Consider the cross AaBb x AaBb. If the alleles for both genes exhibit complete dominance, what genotypic ratio is expected in the resulting offspring?
Correct answer: D. 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1
- A. 1 : 1 : 1 : 1
- B. 9 : 3 : 3 : 1
- C. 3 : 6 : 3 : 1 : 2 : 1
- D. 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1
Explanation
When there is a cross between AaBb X AaBb then the genotypic ratio is 1:2:1:2:4:2:1:2:1.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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