Question

since darwin’s time, scientists have studied genes and gene function in a wide variety of organisms. what type of evidence for evolution is provided by these studies? a. inconclusive evidence, because the genes of ancient species cannot be studied b. inconclusive evidence, because scientists have not yet related genes to physical traits c. weak evidence, because evolution involves changes only to body shape and body functions d. very strong evidence, because of homologous genes and the overwhelming similarities in the genetic code

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Ancient species' genes can be studied (e.g., through fossil DNA or comparative genomics), so this is incorrect.
• Option B: Scientists have related genes to physical traits (e.g., genes controlling eye color, body structure), so this is incorrect.
• Option C: Evolution involves genetic changes (not just body shape/function), and gene studies provide strong evidence, so this is incorrect.
• Option D: Studies of homologous genes and genetic code similarities (e.g., universal genetic code, conserved genes across species) provide very strong evidence for evolution, as they show shared ancestry and genetic relationships.

Answer:

D. Very strong evidence, because of homologous genes and the overwhelming similarities in the genetic code