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Dictionary » S » Sex chromosome Sex chromosomeDefinition noun, plural: sex chromosomes A type of chromosome in the genome that is involved in the determination of the sex as well as the development of sexual characteristics in an organism. It occurs in pairs in somatic cells while singly in sex cells (gametes).
A somatic cell contains a genome comprised of paired chromosomes: the autosomes and sex chromosomes. In humans, there are two forms of sex chromosomes: the X chromosome and Y chromosome. A pair of X and Y results in a male while a combination of X and X results in a female. This XX/XY sex-determination system is one of the most familiar sex-determination systems and is applicable in human beings and most other mammals. In this system, the sex of an organism is determined by the sex chromosomes since these chromosomes bear the genes that control the development of reproductive organs and other sexual characteristics of an organism.
Compare: autosome See also: X-chromosome, Y-chromosome
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Results from our forumHelp to another pedigree... not skipped and sick children have sick parents. It can not be x-linked since sick boys fathers are also sick. This is because the boy gets his Y chromosome through the father's sperm while the good x-chromosome from her mother's eggs.
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What are the genotypes?... the healthy. There may also be that it is x-linked because an affected father not disclose his illness to his son. Boys always get their single X chromosome from their mother and thus can not inherit his father's bad gene.
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Chromosomes... thing for plants in cold climates. And if you have an organism like an ophioglossum fern which has its genome divided between around n=600 chromosomes, an extra chromosome has so few genes that it may just be beneficial in some environments.
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ChromosomesIt would all be detrimental, since you stated whole chromosomes. It all has to do with dosage compensation of gene products. This is why even the double X chromosomes in females has to have one of the chromosomes be inactivated, so as not to cause ...
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ChromosomesWill inheriting extra or insufficient copies of each chromosome be beneficial, detrimenta, or have no effect on offspring? Why?
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