Here are the best answers for each question:
Question 1: Which of the following mutations is least likely to develop into a cancerous tumor?
- A single point mutation - This would be the least likely to develop into a cancerous tumor compared to larger chromosomal mutations, as many point mutations are benign.
Question 2: The mutagens that result in cancer damage DNA by
- weakening the DNA strand or interfering with base pairing - This describes how mutagens typically alter DNA, which can lead to mutations and cancer.
Question 3: How are you able to determine if a cell is undergoing cytokinesis?
- The cell is dormant with no activity taking place. - During cytokinesis, the cell splits into two, and if you are observing a cell that appears inactive, it could suggest it is in a state of completion (though normally you'd see the cleavage furrow or cell plate forming).
Question 4: During telophase, what changes take place with the nucleus?
- The nucleus forms around all sets of chromosomes. - At the end of telophase, nuclear membranes reform around the separated sets of chromosomes.
Question 5: One full cycle of meiosis produces
- four haploid cells - This is the end result of meiosis, where four genetically diverse haploid cells are produced.
Question 6: In what phase of meiosis are sister chromatids separated and pulled to opposite ends of the cell?
- Anaphase II - This is the stage in meiosis II when sister chromatids are separated.
Question 7: If an organism's diploid cells contain 8 chromosomes, how many chromosomes do its haploid cells contain?
- 4 - The haploid number is half of the diploid number (8/2 = 4).
Question 8: Which of the following best describes what happens during a cross-over event?
- Chromatids of homologous chromosomes exchange corresponding segments. - This is the basic description of a crossover event that occurs during prophase I of meiosis.
Question 9: Which of the following statements best describes the major difference between prophase I of meiosis and prophase of mitosis?
- In prophase I, tetrads of homologous chromosomes form and crossing over occurs. - This is a key difference; crossing over does not occur in mitosis.
Question 10: Both mitosis and meiosis begin with a diploid cell that contains replicated chromosomes. What are the main differences between these two processes, and what types of daughter cells produced by each?
- Meiosis has two cell divisions and results in four haploid daughter cells with genetic variation, while mitosis has one cell division and results in two identical daughter cells. - This reflects the fundamental differences in outcomes between mitosis and meiosis.