Generally Only One Sperm Fertilizes an Egg Because

question 71

Multiple Choice

Generally only one sperm fertilizes an egg because

• A)sperm compete against one another before entering and only the most fit one is accepted.
• B)sperm are so few that two are unlikely to arrive at the same time.
• 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 fuses with the egg membrane,it causes the membrane to depolarize and also separates the fertilization membrane and this gap forms a barrier to any other sperm.

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