显性效应 (dominance epistasis)

When white cat cross to black cat, F1 is white cat. F1 cats cross each other, and the proportion of white, black and brown cats in F2 is 9:3:4. What is the reason for this? ( ) A: Dominant epistasis B: Additive effect C: Recessive epistasis D: Suppression

What phenomenon describes a genetic trait that is expressed more strongly or earlier in development with each generation? A: anticipation B: epigenetics C: maternally determined progeny phenotypes D: epistasis