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Grade 12 DNA, RNA, and Genetics
One characteristic Mendel examined was pea pod shape. If a pea plant that is heterozygous for inflated pods (Ii) is crossed with one that is homozygous for constricted pods (ii), what are the possible genotypic and phenotypic ratios of the offspring?
Table 2x2
  1. The genotypic ratio would be 1 Ii : 1 ii. The phenotypic ratio would be 1 inflated : 1 constricted.
  2. The genotypic ratio would be 1 II : 1 Ii : 2 ii. The phenotypic ratio would be 2 inflated : 2 constricted.
  3. The genotypic ratio would be 3 Ii : 1 Ii. The phenotypic ratio would be 4 constricted : 0 inflated.
  4. The genotypic ratio would be 1 II : 2 Ii : 1 ii. The phenotypic ratio would be 2 inflated : 2 constricted.
Grade 10 DNA, RNA, and Genetics
In fruit flies, one of the genes for eye color is found on the X chromosome (making it a sex-linked trait). The allele for red eyes is dominant over the allele for white eyes. Using the notation R, r, and O, what are the possible phenotypes of a cross between a heterozygous red female and a red-eyed male?
Table 2x2
  1. All offspring would have red eyes, regardless of sex.
  2. The females would all have red eyes, and the males would have white eyes.
  3. The females would all have red eyes, and the males would have either red or white eyes.
  4. The males would have white eyes, and the females would have either red or white eyes.
Grade 10 DNA, RNA, and Genetics
Grade 10 DNA, RNA, and Genetics
A cross is performed, and the phenotypic ratio for the traits of the offspring is 9 dominant/dominant : 3 dominant/recessive : 3 recessive/dominant : 1 recessive/recessive. What can be determined about the genotype of the parents?
Table 4x4
  1. Both parents had an AABB genotype.
  2. One parent was AABB, and the other was aabb.
  3. One parent was AaBb, and the other was AABB.
  4. Both parents had an AaBb genotype.
Grade 10 DNA, RNA, and Genetics
When red-flowered snapdragons are crossed with white-flowered snapdragons, the offspring all appear pink. This indicates that the alleles for flower color exhibit incomplete dominance. What flower colors in the offspring would be expected from a cross of two individuals with pink flowers?
Table 2x2
  1. All the offspring would have red flowers.
  2. All the offspring would have pink flowers.
  3. Some offspring would have red flowers, some white, and some pink.
  4. The offspring would have only white or pink flowers.
Grade 10 DNA, RNA, and Genetics
Guinea pigs have dark fur (D) or white fur (d). They also have a rough coat (R) or a smooth coat (r). If two guinea pigs that are heterozygous for both traits are crossed, what are the expected phenotypes of the offspring?
Table 4x4
  1. All the offspring will have dark fur and a rough coat.
  2. All the offspring will have white fur and a smooth coat.
  3. There will be a mixture of dark/rough, dark/smooth, white/rough, and white/smooth offspring.
  4. There will only be dark/rough and white/smooth offspring.
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