Pairing of homologous chromosomes at metaphase of meiosis I appears to be critical for proper alignment, crossing over, and subsequent separation. This pairing is facilitated by sharing of sequence homology. If X and Y chromosomes are so different, how can they achieve the necessary pairing?
A) They share short homologies at their respective tips.
B) They use a unique sex-linked mechanism not present in other pairs.
C) They do not need to pair because they are not a homologous pair.
D) A special function of the spindle apparatus forces X and Y together.
Correct Answer:
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