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Single Cross Problems
Directions:
Do a five step plan for the following genetics problems.
Circle your final answers.
1. When a purebred black guinea pig is crossed with a purebred white
guinea pig, all of the offspring are black. What are the phenotypes
of the F2 generation and their ratios? What are the genotypes of
the F2 generation and their ratios?
2. Solid green color is dominant over striped green in watermelons. If
a solid green watermelon plant, that was a carrier of a striped
green allele, was crossed with a striped green watermelon plant,
What is the percent of each phenotype? What is the percent of
each genotype?
3. When a purebred tall wheat plant is crossed with a purebred short
wheat plant all of the offspring are tall. What percent of the F2
offspring would be tall? What percent of the F2 offspring would
have a heterozygous genotype?
4. Tall is dominant over short in bean plants A homozygous for tall
bean plant was crossed with a heterozygous Tall bean plant. What
is the phenotype ratio? What is the genotype ratio?
5. Blue eyes, in man, is recessive to brown. Show the expected
children of a marriage between a blue-eyed female and a browneyed male that had a blue-eyed mother. Describe the phenotypes
and genotypes of the children.