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  2. Y chromosome microdeletion - Wikipedia

    en.wikipedia.org/wiki/Y_chromosome_microdeletion

    Y chromosome microdeletion is currently diagnosed by extracting DNA from leukocytes in a man's blood sample, mixing it with some of the about 300 known genetic markers for sequence-tagged sites (STS) on the Y chromosome, and then using polymerase chain reaction amplification and gel electrophoresis in order to test whether the DNA sequence corresponding to the selected markers is present in ...

  3. XY gonadal dysgenesis - Wikipedia

    en.wikipedia.org/wiki/XY_gonadal_dysgenesis

    XY complete gonadal dysgenesis, also known as Swyer syndrome, is a type of defect hypogonadism in a person whose karyotype is 46,XY. Though they typically have normal vulvas, [1] the person has underdeveloped gonads, fibrous tissue termed "streak gonads", and if left untreated, will not experience puberty.

  4. 45,X/46,XY mosaicism - Wikipedia

    en.wikipedia.org/wiki/45,X/46,XY_mosaicism

    In 45,X/46,XY, most or all of the Y chromosome is lost in one of the newly created cells. All the cells then made from this cell will lack the Y chromosome. All the cells created from the cells that have not lost the Y chromosome will be XY. [11] The 46,XY cells will continue to multiply at the same time as the 45,X cells multiply.

  5. Scientists have finally decoded mysteries of the Y chromosome ...

    www.aol.com/scientists-fully-sequence-human-y...

    The Y chromosome was a particularly hard nut to crack because it is unusually repetitive. The four letters or building blocks of DNA — adenine (A), cytosine (C), guanine (G) and thymine (T ...

  6. XX male syndrome - Wikipedia

    en.wikipedia.org/wiki/XX_male_syndrome

    The tip of the Y chromosome contains the SRY gene and, during recombination, a translocation occurs in which the SRY gene becomes part of the X chromosome. [15] [26] If a fetus is conceived from a sperm cell with an X chromosome bearing the SRY gene, it will develop as a male despite not having a Y chromosome. This form of the condition is ...

  7. Azoospermia factor - Wikipedia

    en.wikipedia.org/wiki/Azoospermia_factor

    AZF1 is 792kb long and just distal to the centromere of the Y chromosome. [8] AZF1 genes are involved in spermatogenesis in the testes. Common phenotypic manifestations of deletions in this region are azoospermia and Sertoli cell-only syndrome. [3] Men with a complete deletion in the AZFa region are unable to produce testicular spermatozoa for ...

  8. Chromosomal deletion syndrome - Wikipedia

    en.wikipedia.org/wiki/Chromosomal_deletion_syndrome

    Chromosomal deletion syndromes result from deletion of parts of chromosomes. Depending on the location, size, and whom the deletion is inherited from, there are a few known different variations of chromosome deletions. Chromosomal deletion syndromes typically involve larger deletions that are visible using karyotyping techniques.

  9. 46,XX/46,XY - Wikipedia

    en.wikipedia.org/wiki/46,XX/46,XY

    Two ova from the mother are fertilized by two sperm from the father. One sperm contains an X chromosome; the other contains a Y chromosome. The result is that a zygote with an XY genotype and a zygote with an XX genotype are produced. Under normal circumstances, the two resulting zygotes would have gone on to become fraternal twins.