Disruption of meiosis during gametogenesis may result in the formation of chromosomally abnormal gametes. eg nondisjunction which can lead to a numerical chromosomal abnormality such as in down’s syndrome. There is an increase in the likelyhood of chromosomal abnormalities in the embryo after the mother reaches 35 years of age. The ideal maternal age for [...]

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Spermatogenesis is defined as the sequence of events which leads to spermatatozoa (sperms) from primitive germ cells (spermatogonia). Spermatogenesis begins at puberty (roughly 13 to 16 years) and continues well into old age. The primitive germ cells( spermatogonia) remain dormant in the seminiferous tubules until the onset of puberty. With the onset of puberty the [...]

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Semen is the fluid that is ejaculated at the time of orgasm. The average volume of semen per ejaculate is 2.5 to 3.5 mL (after several days of continence). There is a rapid decline in the volume of semen and the sperm count with repeated ejaculation. The semen contains sperms and secretions from the prostate, [...]

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Gametogenesis (also known as gamete formation) is defined as the process of formation and development of specialized generative cells called gametes. The male gamete is the sperm and the female gamete is the oocyte (egg). These are both highly specialized cells. Both male and female gametes have half the number of chromosomes (haploid)than in the [...]

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