Generally,only one sperm fertilizes an egg because
A) there are so few sperm that two are unlikely to arrive at the same time.
B) sperm compete and only the most fit one is accepted.
C) many sperm enter but only one set of chromosomes fuses with the egg nucleus;excess sperm are absorbed.
D) when the first sperm membrane fuses with the egg membrane,a barrier to other sperm forms.
Correct Answer:
Verified
Q14: _ occurs when a fertilized egg enters
Q15: The product of cleavage in a zygote
Q16: What prevents a foreign species' sperm from
Q17: The effect of yolk on cleavage is
Q18: Before fertilization,as an egg cell matures,its nucleus
Q20: In animals,indirect development
A)occurs only in mammals.
B)lacks a
Q21: When the central mass of yolk restricts
Q22: The allantois
A)becomes the chorionic villi.
B)lies next to
Q23: The difference between primary and secondary induction
Q24: The placenta develops from
A)fetal membranes only.
B)maternal tissue
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