Sperm-Egg Interactions Are Species-Specific in Sea Urchins,but Not in Mammals

question 18

Multiple Choice

Sperm-egg interactions are species-specific in sea urchins,but not in mammals.What might be one reason for this difference?

• A)Other kinds of signals serve similar functions in mammals.
• B)Sperm-egg recognition relies on egg cytoplasmic components in mammals.
• C)Sperm have evolved to become more selective in mammals.
• D)Sea urchin fertilization occurs in open ocean.

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