Bio Through the selective permeability mechanism, the plasmic membrane


A. occurs only in multicellular organisms.
b. allows some materials to pass through and prevents the passage of others.
c. allows only the entry of water particles.
d. allows only the exit of metabolic debris.

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4