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Female XX Karyotype (Remember… “kary” means “nucleus”)
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Pre – AP Biology
Process of Meiosis (5.4)
Somatic vs. Germ
Female XX Karyotype(Remember… “kary” means “nucleus”)
Male XY Karyotype
Germ cells
TWO Divisions of Meiosis
Meiosis I -First Division
Meiosis II - Second Division
Spermatogenesis
Spermatogonium
Primary spermatocyte(in prophase of meiosis I)
Mitotic division, producinglarge numbers of spermatogonia
Meiosis I completed
Differentiation and onset of meiosis I
Secondary spermatocyte
Meiosis II
Earlyspermatids
Spermatids(at two stages ofdifferentiation)
Differentiation
Sperm cells Neck
Head Midpiece TailPlasma membrane
MitochondriaAcrosome Nucleus
Sertoli cellnucleus
Lumen ofSeminiferous tubule
Oogenesis in the ovaries
Primary germ cellin embryo
Mitoticdivision
Primaryoocyte
Ovary
Oogonium
Differentiation
Secondaryoocyte
Completion of meiosis Iand onset of meiosis II
Ovulation
First polar body
Entry of spermtriggerscompletionof meiosis IISecond polar body
Ovum
Variation is the outcome desired
Mitosis vs. Meiosis