Generally,only One Sperm Fertilizes an Egg Because

question 13

Multiple Choice

Generally,only one sperm fertilizes an egg because

• A)sperm are so few that two are unlikely to arrive at the same time.
• B)sperm compete against one another before entering,and only the most fit one is accepted.
• C)one small entry hole called the blastopore allows only one sperm to fit through and then seals.
• D)many sperm enter but only one set of chromosomes can fuse with the egg nucleus; the other sperm are absorbed.
• E)when the first sperm membrane fuses with the egg membrane,it forms a fertilization membrane,which blocks penetration by other sperm.

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