Which term describes body parts that share a common function, but not structure?

• A. Analogous structures
• B. Homologous chromosomes
• C. Sister chromatids
• D. Vestigial organs

Answer: (A)

Verified step by step guidance

1. Understand the definitions of the terms provided in the question: Analogous structures, Homologous chromosomes, Sister chromatids, and Vestigial organs.
2. Analogous structures are body parts that perform a similar function but do not share a common structural origin or evolutionary history. For example, the wings of a bird and the wings of an insect are analogous structures.
3. Homologous chromosomes are pairs of chromosomes in a diploid organism that have the same genes at the same loci but may have different alleles. This term is unrelated to body parts or their functions.
4. Sister chromatids are identical copies of a single chromosome that are connected by a centromere. This term is related to cell division, not body parts or their functions.
5. Vestigial organs are body parts that have lost their original function through evolution. They are not related to the concept of sharing a common function but not structure. Based on these definitions, the correct term for body parts that share a common function but not structure is 'Analogous structures.'