Genetics Problems

1)In guinea pigs, black fur is dominant over white fur. How could an animal breeder test whether a black guinea pig is homozygous or heterozygous?
2)A short stem, yellow pod pea plant is crossed with a true breeding long stem, green pod pea plant. Assuming that long stems are dominant to short stems, and green pods are dominant to yellow pods 1) what are the genotypes and phenotypes of the F1 generation? and 2) the genotypes and phenotypes from a F1 x F1 cross?
3)In humans, hemophilia (bleeder’s disease) is a recessive, X-linked trait. Use a Punnett square to show the possible genotypes of offspring of a man who is a hemophiliac, and a normal, but heterozygous woman, where XH contains the normal clotting gene and Xh contains the gene for hemophilia.
4)Lesch-Nyhan syndrome is a metabolic defect caused by the lack of the enzyme hypoxanthine-guanine phosphoribosyl transferase (HGPRT). This disease is the result of an X-linked, recessive mutation and results in mental retardation, selfmutilation and early death. A normal man marries a woman who had a brother who died of LNS. Your are the genetic counselor who will advise them on the likelihood of their having a LNS baby.
a)What are the possible genotypes for the woman? What is the man’s genotype?
b)For each of the woman’s possible genotypes, what are the possible genotypes of her offspring and the implications for survival for each of them?

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