Both male and female reproductive systems have external as well as internal reproductive organs. Based on their functions, they are known as primary or secondary. The principal reproductive organs are called gonads (ovaries and testes) which are responsible for gamete and hormone formation. Other re...
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...
At the climax of coitus, the semen is discharged into the vagina of the female. A single discharge (about a teaspoonful of semen on the average) may contain more than 250 million spermatozoa. Only a few of these will travel as far as the fallopian tubes; if an ovum is present there, ...
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...
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...
The male equivalent of the female gamete, commonly known as the Sperm Cell, or Spermatozoon, is only 60 µ in length. It is not visible to the naked eye and is the smallest human cell.What are Gonads?The organs that produce gametes are called Gonads. The Gonads form a part of the ...
The parts of the female reproductive tract normally include two ovaries, two uterine tubes (also calledfallopian tubes), a single pear-shaped uterus, and a single vagina. Gamete production is the responsibility of the ovaries, whereas protection and nourishment of the growing embryo and fetus befor...
What is female sperm called? They are also referred to as sex cells. Female gametes are calledova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome. These reproductive cells are produced through a type of cell...
Both male and female gamete generating cells produce processed pseudogenes in the human genomeProcessed pseudogenesHuman genomeY chromosomeOogenesis hypothesisRetrotranscriptionSpermatogenesisGametogenesisThe human genome contains an unusually large number of processed pseudogenes. The fact that processed pseudogenes ...
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...