2. Eukaryotic cells differ from prokaryotic cells by the type of their division.
- Eukaryotic cells can divide by mitotic division and meiotic division.
- Prokaryotic cells divide by binary fission.
- Both eukaryotic and prokaryotic cells divide by binary fission.
- Eukaryotic cells divide by cytoplasmic division.
3. The events of the cell cycle:
- Are under genetic control.
- Include the following stages: G1, S, G2, G0, and M.
- cdc2 and p53 genes are important in regulating the cell cycle.
- Take different times for different types of living organisms.
4. If the phenotypic ratio of a given generation from a genetic cross is 1:1:1:1, then the genotypes of their parents can be one of the following:
- AABB x AaBb
- AaBB x Aabb
- AaBb x aabb
- AAbb x AABB
5. In the cross Rr Tt x rr tt, if red (R) is dominant over white (r) and tall (T) is dominant over dwarf (t):
- 25% of offspring will be tall with red fruit.
- 50% will be tall with red fruit.
- 75% will be tall with red fruit.
- All will be tall with red fruit.
6. Crossing over during meiosis occurs between:
- Nonsister chromatids of a bivalent.
- Two different bivalents.
- Sister chromatids of the same chromosome.
- Sister chromatids of different chromosomes.
7. Gametes contain one type of each kind of chromosome because:
- Two replications of DNA occur during meiosis.
- The homologous chromosomes separate during the first meiotic division.
- Crossing over occurs during prophase II.
- The homologous chromosomes separate during meiosis II.
8. The substages of meiotic prophase I are the following:
- Leptonema, zygonema, pachynema, diplonema, and diakinesis.
- Leptonema, zygonema, diakinesis, and diplonema.
- Diakinesis, diplonema, pachynema, leptonema, and zygonema.
- Pachynema, leptonema, zygonema, diakinesis, and diplonema.