1. Some males are sterile because their sperm cannot
fertilize an oocyte. What are some possible defects in sperm that would prevent
them from fertilizing an oocyte?
2. The genes for red photopigments and green
photopigments are located on the X chromosome. Explain how this makes males
more prone to red-green color blindness.
3. Which of the following class of pathogens consists of
only unicellular organisms?
e) None of the above
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