Proper division of chromosomes fails more frequently in mammalian oogenesis than in mammalian spermatogenesis. What is the most likely reason for this phenomenon?
a. Crossover events occur in oogenesis but do not occur in spermatogenesis.
b. Oogenesis creates polar bodies, whereas spermatogenesis does not.
c. Primary oocytes are haploid, whereas primary spermatocytes are diploid.
d. Oogenesis is arrested in prophase I, whereas spermatogenesis is not arrested.
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