What is a homologous chromosome?

• A. Identical copies of chromosomes
• B. Chromosomes that are similar in shape, size, and genetic content
• C. Chromosomes from different species
• D. Chromosomes that undergo independent assortment

Answer: (B)

A homologous chromosome refers to pairs of chromosomes that are similar in shape, size, and genetic content. Each pair consists of one chromosome inherited from each parent, containing genes for the same traits but possibly different alleles. This similarity allows for proper alignment and segregation during meiosis, facilitating genetic diversity through recombination.

Identical copies of chromosomes, which are often referred to as sister chromatids, are formed during DNA replication and are not considered homologous chromosomes, since they originate from the same molecule. Chromosomes from different species do not qualify as homologous since they are not similar enough in structure or genetic information to align properly. Independent assortment pertains to the random distribution of homologous chromosomes into gametes during meiosis, which is a separate concept from the definition of homologous chromosomes themselves.