enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. XY sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XY_sex-determination_system

    In humans and many other species of animals, the father determines the sex of the child. In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.

  3. Klinefelter syndrome - Wikipedia

    en.wikipedia.org/wiki/Klinefelter_syndrome

    Klinefelter syndrome (KS), also known as 47,XXY, is a chromosome anomaly where a male has an extra X chromosome. [10] These complications commonly include infertility and small, poorly functioning testicles (if present).

  4. Sex-determination system - Wikipedia

    en.wikipedia.org/wiki/Sex-determination_system

    Some chromosomal sex determination systems in animals. A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. [1] Most organisms that create their offspring using sexual reproduction have two common sexes and a few less common intersex variations.

  5. Sexual differentiation in humans - Wikipedia

    en.wikipedia.org/wiki/Sexual_differentiation_in...

    Testosterone will also control the descending of the testes from the abdomen into the scrotum. Dihydrotestosterone, also known as (DHT) will differentiate the remaining male characteristics of the external genitalia. [11] Further sex differentiation of the external genitalia occurs at puberty, when androgen levels again become disparate.

  6. Hermaphrodite - Wikipedia

    en.wikipedia.org/wiki/Hermaphrodite

    According to Ovid, he fused with the nymph Salmacis resulting in one individual possessing physical traits of male and female sexes. [12] According to the earlier Diodorus Siculus, he was born with a physical body combining male and female sexes. [13] The word hermaphrodite entered the English lexicon as early as the late fourteenth century. [14]

  7. X chromosome - Wikipedia

    en.wikipedia.org/wiki/X_chromosome

    Males with Klinefelter syndrome typically have one extra copy of the X chromosome in each cell, for a total of two X chromosomes and one Y chromosome (47,XXY). It is less common for affected males to have two or three extra X chromosomes (48,XXXY or 49,XXXXY) or extra copies of both the X and Y chromosomes (48,XXYY) in each cell.

  8. Sexual characteristics - Wikipedia

    en.wikipedia.org/wiki/Sexual_characteristics

    Male primary sex characteristics are the penis, the scrotum and the ability to ejaculate when matured. Female primary sex characteristics are the vulva, vagina, uterus, fallopian tubes, cervix, and the ability to give birth and menstruate when matured. [1] Hormones that express sexual differentiation in humans include: estrogens such as estradiol

  9. Y chromosome - Wikipedia

    en.wikipedia.org/wiki/Y_chromosome

    The Y chromosome is one of two sex chromosomes in therian mammals and other organisms.Along with the X chromosome, it is part of the XY sex-determination system, in which the Y is the sex-determining chromosome because the presence of the Y chromosome causes offspring produced in sexual reproduction to be of male sex.