16 Jun Academy Biology Genetics Problems Assignment
Question
Academy Biology Genetics Problems
Directions: On a separate sheet of paper solve each of these problems. Show all work for complete credit, including Punnett squares and complete sentence answers where required.
1. In humans, the gene for dark colored eyes (black or brown) is dominant over the genes for light colored eyes (blue, green, or gray). A man with brown eyes marries a woman with blue eyes. They have two children, a boy with brown eyes and a girl with blue eyes. What are the genotypes all of the members of the family?
2. A man with brown eyes marries a woman with blue eyes. They have a family of six brown eyed children – four girls and two boys. What are the most likely genotypes and phenotypes of all of the members of this family?
3. A brown eyed man marries a blue eyed woman. They have five children, two with brown eyes and three with blue eyes. What are the most genotypes of all of the members of this family?
4. A brown eyed man with a blue eyed mother marries a brown eyed woman with a blue eyed father. What is the probability that their first child will be blue eyed? That the second child will be blue eyed? That the third child will be a blue eyed boy?
5. In morning glories, the heterozygous phenotype for red flowers, R, and white flowers, r is pink flowers. A plant with pink blossoms is isolated from the others and allowed to self pollinate. Predict the genotypic and phenotypic ratio which would be expected to result from this cross.
6. In the cross above, the plant was allowed to self pollinate. Why then is this considered a form of sexual reproduction when there is apparently only one parent?
7. In the morning glories, described above, a line of plants breeds true for red blossoms. Predict the results expected if a garden were planted from seeds derived from a cross between one of the red flowerd plants with a pink flowered plant.
8. In humans, the inheritance of blood type (A, B, or O) is determined by at least three alleles. The allele A codes for type A blood. The allele B codes for type B blood. Neither allele A or B is dominant over the other, the heterozygous condition resulting in blood type AB. Both alleles A, and B are however dominant over blood type O. A man and his wife both have type A blood. Their child is born with blood type O. How is this explained?
9. A man whose father is type B and whose mother is type A, has blood type A. He marries a type A woman, whose parents had the same blood types as his parents. What are the genotypes of the man and his wife and what is the probability that their first child will inherit type A blood?
10. A type A man whose mother was type O marries a woman with type B blood. Their son has type B blood. This son marries a girl with type B blood. They have six children. Five are type B and one is type O. What are the genotypes of the man, woman, son, girl, and children?
11. In Andalusian fowl, the plumage for black feathers and the plumage for white feathers are codominant, the heterozygous condition resulting in mottled (black + white) plumage. A mottled hen is bred with a white rooster. Predict the genotypic and phenotypic ratio of the offspring. Explain why the mottled condition is considered codominant rather than incomplete dominance.
12. In corn, the gene for purple kernels, P, is dominant to the gene for yellow kernels, p. The gene for starchy, S, is dominant to sweet kernels, s. (Starchy ones appear full while sweet ones appear wrinkled). The two traits are known to be inherited independently. A strain of corn breeds true for purple, sweet kernels. Another strain breeds true for yellow, starchy kernels. What are the genotypes for both strains of corn plants? Assume the plants were cross bred. Predict the outcome of this cross on the next generation of corn plants?
13. The corn plants from the first generation, above (F1), are now allowed to self pollinate. What is the expected genotypic and phenotypic ratio expected in the F2 generation of corn plants?
14. The F1 generation of plants above are backcrossed with the parent which is recessive for both traits. Predict the expected genotypic and phenotypic ratio for this cross.
15. Determine the genotypes for the two parent corn plants for each of the following results:
a. 318 purple starchy kernels, 98 purple sweet kernels
b. 323 purple starchy, 106 yellow starchy
c. 410 purple starchy
d. 150 purple starchy, 147 yellow sweet, 142 yellow starchy, 151 purple sweet
e. 223 purple starchy, 72 purple sweet, 76 yellow starchy, 27 yellow sweet.
16. In Drosphila, at least two genes are involved in eye color, S and B. The genes are inherited independently of one another. If both dominant genes are inherited (at least one S and one B) the wild type eye color (red) results. If the homozygous recessive ss is inherited the eyes are scarlet red in color but if the other homozygous recessive gene is inheritied, bb, brown eye color results. The double homozygous recessive condition, ssbb, results in white eyed flies which often die as juveniles. A strain of flies with scarlet red eyes are bred with another strain with brown eyes. Predict the expected genotypic and phenotypic ratio of this cross.
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