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Oogenesis - Haploid after meiosis I ?
I understand everything, how the primordial follicles are made, secondary oocytes, corpus luteum, and such
but what I cannot wrap my head around is that the primary oocyte halts at meiosis I , prophase I. then at puberty, it develops and undergoes meiosis I completely, but stops at metaphase I of meiosis II, and it is still called a haploid? Im not sure what Im saying, so can someone explain to me, how can the oocyte not complete meiosis but still end up being a haploid? how is that possible?
2 Answers
- DNAunionLv 71 decade agoFavorite Answer
At metaphase II, each cell has only 1 chromosome of each, however, that chromosome consists of 2 sister chromatids. So the cell has only 1 chromosome 1 (say, maternal), 1 chromosome 2 (say, paternal), 1 chromosome 3 (say paternal), 1 chromosome 4 (say, maternal), etc. It does not have a maternal copy and a paternal copy of each chromosome, so it is not diploid.
- 1 decade ago
Reduction of the chromosome number begins in Anaphase I of Meiosis I, when the bivalents split up and the chromosomes are pulled to opposite poles. At the end of Meiosis I the primary oocyte has produced a secondary oocyte which is haploid (half the chromosome number). Division of the haploid secondary oocyte produces a haploid ovum. A haploid cell is produced by Meiosis I not Meiosis II.