Within the capillaries of the lungs, gases are exchanged by diffusion; oxygen diffuses from the to the and carbon dioxide diffuses from the to

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?