Agroup of similar cells that perform a single function is called a(an)
a. nerve.
c. tissue.
b. organ.
d. organ system.

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?