The least amount of solar energy on an annual basis is experienced at

In fruit flies, gray bodies (g) are dominant over black bodies (g), and brown pigments (n) are dominant over yellow pigments (n). each individual possesses two alleles for each trait. if a fly that is homozygous dominant for both traits is crossed with a fly that is homozygous recessive for both traits, what is the predicted genotype of the offspring.

Ineed to know why d is the correct answer asap

Which of th following best describes how genes produce traits in an organism?