Those of the male are called testes; those of the female are ovaries. The gonads are paired structures, although in some forms what appears to be an unpaired gonad is the result either of fusion of paired structures or of unilateral degeneration. The reproductive elements formed in the gonads...
(Physiology) any of the male reproductive cells released in the semen during ejaculation, consisting of a flattened egg-shaped head, a long neck, and a whiplike tail by which it moves to fertilize the female ovum. Also called:spermorzoosperm ...
Unique for its role in human reproduction, agameteis a specialized sex cell carrying 23 chromosomes—one half the number in body cells. At fertilization, the chromosomes in one male gamete, called asperm(or spermatozoon), combine with the chromosomes in one female gamete, called an oocyte...
The male external genitalia is called penis. The female reproductive system consists of a pair of ovaries, a pair of oviducts, a uterus, a vagina, external genitalia, and a pair of mammary glands. The ovaries produce the female gamete (ovum) and some steroid hormones (ovarian hormones). Ova...
Production of the female gamete, the egg, followed by its release from the ovary is called ovulation. Ovulation is cyclical and predictable. These cycles are called menstrual cycles in humans. Cyclical changes in hormone secretion by ovaries cause changes in the entire female reproductive tract, in...
Elite female athletes (who have lower endogenous testosterone concentrations than males) have greater performance-enhancing effects from exogenous testosterone than elite male athletes (Franke & Berendonk, 1997). These findings suggest that, generally, females represent the low-to-middle region of the ...
human females have 22 pairs of autosomes and contain only the $X$ sex chromosome. The sex of an individual is determined by the type of the male gamete (X or $Y)$, which fuses with the $X$ chromosome of the female. If the fertilizing sperm is $X$, then the baby will be a girl...
Sexual reproduction involves two parents, where one gamete is obtained from the male and the other gamete is obtained from the female. Hence, this requires fertilisation, which is the fusion of the nucleus of the male sex cell (e.g. sperm) to the nucleus of the female sex cell (e.g. ...
The ovaries produce the Female gamete and some steroid hormones. Ovarian follicles in different stages of development are embedded in the stroma. The process of formation of mature Female gametes is called Oogenesis. Menstrual cycle starts only after reaching puberty and each cycle lasts for about ...
n, Haploid number; M, metacentric; S, submetacentric; A, acrocentric; X, female sex chromosome; Y, male sex chromosome. * Based on one female. Evolutionary rearrangement of the karyotype most commonly involves chromosome fusion or fission. These changes are also known as Robertsonian translocation...