Reference no: EM132686589

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 tomatoes, red fruit color is dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow. Determine the phenotype. As well genotype of

a) the F1 offspring

b) the offspring of a cross of the F1 back to the red parent

c) the offspring of the F1 back to the yellow parent

4) A man has 6 fingers on each hand and 6 toes on each foot. His wife and their daughter have the normal number of digits. Extra digits is a dominant trait. What fraction of this couple's children would be expected to have extra digits?

5) Phenylketonuria (PKU) is a human autosomal genetic disorder in which the affected individual cannot metabolize the amino acid phenylalanine. The disease is characterized by severe mental retardation if left untreated. The disease is caused by homozygosity for a recessive, mutant allele. If two parents are heterozygous for the allele, what is the probability that their child will have PKU?

6) Cystic fibrosis is a recessive genetic disease caused by mutations in the CFTR gene located on chromosome #7. A man who does not have cystic fibrosis but is known to carry one of the CF genes marries a woman who is not a carrier of the CF gene. What is the probability that they would have a child with cystic fibrosis?