1. Mendel's law of segregatioin was nearly impossible for most biologists to understand until there was a general understanding of

    E. meiosis
  2. A couple who are both carriers of the gene for cystic fibrosis have two children who have cystic fibrosis. What is the brobability that their next child will be phenotypically normal?

    A. 75%
  3. Roan color in cattle is the result of incomplete dominance between red and white color genes (Rr). How would one produce a herd of pure-breeding roan-colored cattle?

    A. cross roan with roan
  4. Albinism is caused by a recessive autosomal allele. A man and woman, both normally pigmented, have an albino child together.The mother is now pregnant for a third time, and her doctor tells her she is carrying fraternal twins. What is the probability that both children will have normal pigmentation?

    A. 9/16
  5. A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

    C. HT
  6. Which of the following terms is least related to the others?

    A. tetrad
  7. Two true-breeding stocks of garden peas are crossed. One parent had red, axial flowers and the other had white, teminal flowers; all F1 individuals had red, azial flowers. If 1,000 F2 offspring resulted from the cross, how many of them would you expect to have red, terminal flowers? (Assume independent assortment)

    C. 190
  8. Given the parents AABBCc X AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

    C. 3/4
  9. A 1:2:1 phenotypic ratio in the F2 generation of a nonohybrid cross is a sign of

    A. incomplete dominance
  10. A 9 purple to 7 white phenotype in sweet peas in the F2 generation is most likely due to

    C. epistasis
  11. Three babies were recently mixed up in a hospital. After consideration of the data below, which of the following represent the correct baby/parent combinations?
    C. I-2,II-3,III-1
    C. I-2,II-3,III-1
  12. Which of the following is an example of polygenic inheritance?

    D. skin pigmentation in humans
  13. Hydrangea plants of the same genotype are planted in a large flower garden. Som of the plants produce blue blowers and others pink flowers. This can be best explained by

    D. environmental factors such as soil pH
  14. Which of the following terms is least related to the others?

    C. epistasis
  15. A man is brought to court in a paternity case. He has blood type B, Rh positive. The mother has blood type B, Rh negative. Which blood type of a child would exclude the accused from paternity?

    D. AB, Rh negative
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