What is the "scale of cells"?

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.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

What is the cause hearing loss in human being