Scientists studying a meadow ecosystem collect western white butterflies from a single population in the spring and summer. They notice that all individuals that hatch in the spring have darker wings than those that hatch in the summer. What is the most likely explanation for these different traits?
a
Different alleles are inherited at different times of the year.
b
Different environmental factors affect gene expression for wing color.
c
Wing color is a polygenic trait in these butterflies.
d
Wing color is influenced by codominance of alleles.