Question

beak size in ground finches____
is a quantitative trait.
is controlled by genes acquired during a finchs lifetime.
is controlled by genes that mutate in response to a drought.
is determined by environmental factors, not genes

Explanation:

• Quantitative traits are traits that show continuous variation (e.g., height, weight, beak size). They are usually controlled by multiple genes (polygenic) and can be influenced by the environment.
• Genes are inherited from parents, not acquired during an individual's lifetime.
• While mutations can occur, the idea that genes mutate specifically in response to a drought in a way that directly controls beak size in a single - generation, non - evolutionary sense is incorrect. Mutations are random events.
• Beak size is not solely determined by environmental factors; genetic factors play a crucial role as it is a heritable trait (as seen in evolutionary studies of finches, e.g., Darwin's finches where beak size changes over generations due to genetic changes related to natural selection).

Answer:

is a quantitative trait.