Question

multiple-choice question
what kinds of environmental factors influence the expression of traits?
the presence of the alleles in the parents
the amount of uv rays and the amount of calcium in nutrition

Explanation:

To determine the correct option, we analyze each choice:

• The first option, "the presence of the alleles in the parents", refers to genetic (not environmental) factors, as alleles are part of an organism's genetic makeup.
• The second option, "the amount of UV rays and the amount of calcium in nutrition", includes environmental factors: UV rays are an external environmental factor, and calcium in nutrition is an environmental (dietary) factor that can influence trait expression (e.g., UV affects skin traits, calcium affects bone development).

Answer:

the amount of UV rays and the amount of calcium in nutrition