What is the expected phenotypic ratio from a cross of heterozygotes (a1a2 x a1a2) for a phenotype that expresses incomplete dominance?
a. 1: 1: 1: 1
b. 1: 1
c. 1: 2: 1
d. 3: 1

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

What field of science did harry hess study?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?