A child's genetic disorder is thought to have arisen from a process called crossing over. The mother says, "I can't believe this happened. Is it because of something I did while I was pregnant?" How should the nurse respond?
1. "No, crossing over only happens in sperm."
2. "No, crossing over occurred before you got pregnant."
3. "Did you drink alcohol during your pregnancy?"
4. "Crossing over happens very late in embryonic development. It is random and is not caused by anything you did."
2
Rationale 1: Crossing over occurs during meiosis, which is the process by which both eggs and sperm are created.
Rationale 2: Crossing over occurs during the development of the egg or sperm.
Rationale 3: Crossing over occurs during meiosis, which is the process of creating eggs and sperm. Alcohol use after fertilization would not affect this process.
Rationale 4: Crossing over occurs during meiosis, which is the process of creating eggs and sperm.
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