Sex chromosome - Wikipedia
A sex chromosome (also referred to as an allosome, heterotypical chromosome, gonosome, or heterochromosome, or idiochromosome) is a chromosome that differs from an ordinary autosome in form, size, and behavior. The human sex chromosomes, a typical pair of mammal allosomes, determine the sex of an individual created in sexual reproduction.Autosomes differ from allosomes because autosomes appear ...
Sex Chromosome - Genome.gov
A sex chromosome is a type of chromosome that participates in sex determination. Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells.
sex chromosome | Definition, Examples, & Facts | Britannica
Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes.
Sex-determination system - Wikipedia
The XX/XY sex-determination system is the most familiar, as it is found in humans. The XX/XY system is found in most other mammals, as well as some insects.In this system, most females have two of the same kind of sex chromosome (XX), while most males have two distinct sex chromosomes (XY).
Gamete Definition, Formation, and Types
A sperm cell with a Y sex chromosome results in a male (XY) and a sperm cell with an X sex chromosome results in a female (XX). Types of Sexual Reproduction . The type of sexual reproduction of an organism is largely dependent on the size and shape of its gametes. Some male and female gametes are of similar size and shape, while others are ...
Overview of Sex Chromosome Abnormalities - Children's ...
Sex chromosome abnormalities are common and cause syndromes that are associated with a range of physical and developmental problems. Many of these syndromes are not noticed while the mother is pregnant but may be discovered if prenatal testing is done for other reasons, such as older age in the mother.
Numeric sex chromosome variations | Genetic and Rare ...
Numeric sex chromosome variations refers to differences in the number of sex chromosomes that may be present in an individual's body cells. Males typically have one X chromosome and one Y chromosome in each body cell with a total of 46 chromosomes (46, XY); females typically have two X chromosomes in each body cell (46, XX).
Human Chromosomal Abnormalities: Sex Chromosome Abnormalities
Sex chromosome abnormalities are gender specific. Normal males inherit an X and a Y chromosome while females have two X's. A single Y chromosome is sufficient to produce maleness while its absence is necessary for femaleness. Female abnormalities are due to variations in the number of X chromosomes.
Variations | The Association for X and Y Chromosome Variations
About X and Y Variations X and Y Variations, also known medically as Sex Chromosome Aneuploidy (SCA), involve variations in the typical number and type of sex chromosomes. The typical number of chromosomes in each human cell is 46. These include 22 pairs of “autosomes” (which refers to all
NIPT Sex chromosome aneuploidy or fetal sex inconclusive
About 1 in every 500 newborns has a sex chromosome aneuploidy (SCA) conditionThese conditions happen . randomly and do not run in the family. The three most common conditions are: SCA . Turner syndrome (45,X or Monosomy X) Turner syndrome is a genetic condition that only happens in females. It is caused by a