Generally, Only One Sperm Fertilizes an Egg Because

question 43

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 forms a barrier to the penetration of other sperm.

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