Question: 9. Pairing of homologous chromosomes at metaphase of meiosis I appears to be critical for proper …

9. 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 do 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.