Genetics

Step 1: Determine Total Combinations
In a dihybrid cross AaBb × AaBb, each trait (A and B) segregates independently. Total offspring combinations = .

Step 2: Find Offspring with No Recessive Traits
For each trait: - Probability of not having recessive : - Probability of not having recessive : - Probability of no recessive traits:

Step 3: Calculate Probability of At Least One Recessive Trait

Step 4: Convert to Percentage

- Mendel's law of independent assortment states that alleles of different genes assort independently during gamete formation.
- This is explained by the random alignment of homologous chromosome pairs during metaphase I of meiosis, which leads to independent segregation, making (C) correct.
- (A) is incorrect because independent assortment applies mainly to genes on different chromosomes or those far apart on the same chromosome.
- (B) polygenic inheritance involves multiple genes influencing a trait, which is separate from independent assortment, so (B) is incorrect.
- (D) is incorrect because the law of independent assortment is demonstrated using dihybrid crosses.
Answer: