Variety in species exists because

a. mitosis
b. asexual reproduction
c. fission
d. sexual reproduction

Look at the punnett square for an x-linked recessive disease. is it possible for a female offspring to have the disease?

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

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?