Whats the answer to this problem(8,-3), (1,8)

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?

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans

Which individual below would be considered heterozygous? a.dd b.dd c.dd