What was the ratio of the new phenotypic combination in F2 of Mendel's dihybrid?
Correct answer: D. D: 6/16
- A. A: 3/16
- B. B: 1/16
- C. C: 9/16
- D. D: 6/16
Explanation
The expected phenotypic ratio in the F2 generation of a dihybrid cross (AaBb x AaBb) is 9:3:3:1, indicating that there are three different combinations for the traits involved. Specifically, the 6/16 ratio corresponds to the two dominant traits appearing together or in combination with one dominant and one recessive trait (6 combinations in total) while 9/16 reflects the dominant-dominant combination. The other options (3/16 and 1/16) represent combinations that are less common and do not reflect the new phenotypic combinations in the F2 generation.
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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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