Question
How many types of phenotypic classes are there in an F2 generation of a Mendelian dihybrid cross?
4
9
8
16
4
9
8
16
Answers
GPT-4o mini
In a Mendelian dihybrid cross, two traits are considered, each controlled by different genes. When you cross two individuals that are heterozygous for both traits (e.g., AaBb x AaBb), the F2 generation will produce 4 different phenotypes for each trait. Since there are two traits, the total number of phenotypic combinations in the F2 generation will be 3 for the first trait (AA, Aa, aa) and 3 for the second trait (BB, Bb, bb), resulting in 3 x 3 = 9 different phenotypic classes.
Therefore, the correct answer is **9**.
Therefore, the correct answer is **9**.