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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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ppk ppk
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12 years ago
 In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are     
A) the jelly coat of the egg and the vitelline membrane.
B) inactivation of the sperm acrosome.
C) the cortical reaction and the formation of yolk protein.
D) the acrosomal reaction and the formation of egg white.
E) membrane depolarization and the cortical reaction.
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bio_manbio_man
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