Cystic Fibrosis is a recessive genetic disorder. Ron is homozygous dominant and Nancydoes not have the disorder but is a carrier. Using a Punnett square, what is the probability
that their children will have cystic fibrosis? Give Genotypic and phenotypic ratios.
2. Feather color in budgies is determined by two different genes Y and B. YYBB, YyBB, or
YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow and yybb is white.
a. If a blue budgie is crossed with a white budgie, what are the phenotypic ratios seen?
Show all work
b.
What types of offspring are not possible? Explain
3. A woman with type A blood is claiming that a man with type AB blood is the father of her
child who is type B. Could this man be the father of the child? Explain and show all work.
4. In Japanese four o’clock plants red (R) color in incompletely dominant over white (W)
flowers, the heterozygous plants result in pink flowers. For each of the following construct a
Punnett square and give the genotypic and phenotypic ratios of the offspring.
a. Red plant with white plant
b.
Red plant with pink plant
c. White plant with pink plant
d.
Two pink plants
5. A man is normal for hemophilia and his wife is a carrier. What are the possible children that
this couple could have?
6. A man and his wife both have normal color vision, but a daughter has red-green
colorblindness, a sex-linked recessive trait. The man sues his wife for divorce on grounds of
infidelity (cheating). Provide evidence to support his case.
7. (3pts EXTRA CREDIT!) Coat color in a certain breed of cows shows codominance. Red
being dominant, white being dominant, and roan (red and white) showing the heterozygous
phenotype. These cows also have a second gene for horn vs. hornless cattle. The allele for
horns minates the allele for hornless.
a. If a bull and cow are heterozygous for both genes, what are the probabilities of each
possible phenotype?
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