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| 1. |
Some plants are triploid. If a plant has a chromosome number of 42, how many chromosomes are present in its somatic cells?
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| 2. |
When a sperm and egg combine, the resulting embryo has
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| 3. |
If a cell has a diploid number of 50, how many chromosomes are present in the nucleus at the beginning of meiosis? How many chromosomes are present in each resulting cell at the end of meiosis?
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| 4. |
In the figure shown, what possible phenotypes would the resulting gametes code for, if there was crossing over of the hair color genes on the maternal and paternal chromosomes during meiosis I?
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| 5. |
Which of the following represents the number of possible combinations, in gametes after meiosis, of six genes that are all located on different chromosomes?
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| 6. |
Which of the following statements is true about the life cycle shown in the figure?
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| 7. |
Which of the following is the leading hypothesis to explain why many organisms reproduce sexually?
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| 8. |
The cells that produce sperm in humans contain 46 chromosomes. If one of these cells undergoes meiosis to form sperm cells, and chromosomal nondisjunction occurs in chromosome 22 during meiosis I, what is the chromosome number in each of the resulting sperm?
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| 9. |
The cells that produce sperm in humans contain 46 chromosomes. If one of these cells undergoes meiosis to form sperm cells, and chromosomal nondisjunction occurs in chromosome 22 during meiosis II, what is the chromosome number in each of the resulting sperm?
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| 10. |
Which of the following is the best interpretation of the data shown in the graph?
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| 11. |
Which of the following occurs during meiosis II, but does NOT occur as part of meiosis I?
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| 12. |
Crossing over
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| 13. |
Which of the following best describes the cell shown in the figure? 
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| 14. |
An individual plant that exhibits self-fertilization can produce offspring different from itself primarily as the result of:
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| 15. |
This figure demonstrates which of the following? 
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| 16. |
Robert’s father has brown eyes and brown hair, while his mother has blue eyes and blonde hair. Assume that the two traits are linked. Robert has a daughter with brown eyes and blonde hair. Genetics tests have shown that Robert contributed his mother’s hair and eye color chromosome to his daughter. Which of the following would most likely explain his child’s hair and eye color? (Assume, for this question, that the daughter’s mother’s eye color and hair color genes are not expressed.)
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| 17. |
If a fatal infection were to infect this aspen tree, which of the following would most likely be the effect on the aspen grove? 
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| 18. |
Which of the following best describes “alternation of generations,” the life cycle employed by most land plants?
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| 19. |
Which of the following would be most affected by a mutation that occurred at a single locus on one chromosome?
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| 20. |
Which of the following statements is true?
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Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
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