• allele
  • This is because the male who inherits the recessive allele on his X chromosome has no allele on his Y chromosome to counteract its effects. (britannica.com)
  • The female, on the other hand, must inherit the recessive allele on both of her X chromosomes in order to fully display the trait. (britannica.com)
  • A woman who inherits the recessive allele for a sex-linked disorder on one of her X chromosomes may, however, show a limited expression of the trait. (britannica.com)
  • normally
  • The female has two X chromosomes, and all female egg cells normally carry a single X. The eggs fertilized by X-bearing sperm become females (XX), whereas those fertilized by Y-bearing sperm become males (XY). (britannica.com)