What does independent assortment refer to in genetics?

• A. The uniform distribution of a single gene copy into gametes.
• B. The linkage between genes on the same chromosome.
• C. The pairing of homologous chromosomes during meiosis.
• D. The random arrangement of maternal and paternal chromosomes during gamete formation, leading to various combinations.

Answer: (D)

Independent assortment is about the random distribution of chromosome copies into gametes during meiosis, which creates many possible genetic combinations. Because the maternal and paternal chromosomes orient randomly, alleles from different genes end up in diverse pairings in the gametes, increasing variation in offspring. This idea is not about uniformly distributing a single gene copy, and it’s distinct from gene linkage, where genes on the same chromosome tend to be inherited together. It’s also not about the pairing of homologous chromosomes itself—the pairing is a step that allows segregation to happen, while independent assortment describes the random outcome of which chromosome ends up in a given gamete.