Biology question...PLEASE HELP!!?

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Veronica :)

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The formation of the bivalent during meiosis
Choose one answer.
a. is required for the pairing of homologous chromosomes.
b. contributes to the genetic diversity of a species.
c. ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell.
d. aids the alignment of sister chromatids in a single row along the metaphase plate.
e. occurs during meiosis II.


Best answer = 10 points!
please help- i really dont understand this! please explain WHY/HOW you got your answer!!
thanks in advance!! :)
i think the answer is with a or d...please tell me what you think! thanks
 
b. contributes to the genetic diversity of a species.

Why: The rest are irrelevant.
And:
This 'b', implied the occurrence of crossing over where homeologous chromosomes can share segments. This sharing is one component of genetic diversity
m
 
b. contributes to the genetic diversity of a species.

Why: The rest are irrelevant.
And:
This 'b', implied the occurrence of crossing over where homeologous chromosomes can share segments. This sharing is one component of genetic diversity
m
 
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