The second maturation division of the mammalian ovum occurs:
Shortly after ovulation before the ovum makes its way into the fallopian tube
Until after the ovum has been penetrated by a sperm
Until the nucleus of the sperm has fused with that of the ovum
In the Graafian follicle following the first maturation division
According to the sources, oogenesis is a staggered process. The first meiotic division is completed within the tertiary follicle just prior to ovulation . The resulting secondary oocyte is released from the Graafian follicle during ovulation . The second meiotic division is only triggered when a sperm penetrates the ovum's plasma membrane . This division is also unequal, resulting in a second polar body and a haploid ovum (ootid), which then proceeds to fuse with the sperm nucleus to form a zygote .
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