Fraternal twins occur when ________
A) a single fertilized ovum splits
B) two ova are fertilized
C) the father's sperm contains an X chromosome
D) the father's sperm contains a Y chromosome
B
Explanation: A) This describes identical twins, not fraternal twins.
B) Correct! Because two different ova are fertilized, fraternal twins can be two males, one male and one female, or two females.
C) The father's sperm contains either an X or Y chromosome, but this is not the cause of fraternal twins.
D) The father's sperm contains either an X or Y chromosome, but this is not the cause of fraternal twins.
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