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  2. Genetics of Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Genetics_of_Down_syndrome

    Translocation Down syndrome can be de novo; that is, not inherited but occurring at the time of an individual's conception, or may be inherited from a parent with a balanced translocation. The balanced translocation figure shows a 14/21 translocation between the long arms of chromosomes 14 and 21, where the other chromosomes are not shown.

  3. Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Down_syndrome

    Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.

  4. Everything you need to know about Down syndrome - AOL

    www.aol.com/news/everything-know-down-syndrome...

    In most cases, Down syndrome is not inherited. Translocation Down syndrome can be passed from parent to child, but this is rare. In these cases, the parent may have extra genetic material from ...

  5. Robertsonian translocation - Wikipedia

    en.wikipedia.org/wiki/Robertsonian_translocation

    In rare cases this translocation results in Down syndrome and Patau syndrome. [2] Robertsonian translocations result in a reduction in the number of chromosomes. A Robertsonian evolutionary fusion, which may have occurred in the common ancestor of humans and other great apes, is the reason humans have 46 chromosomes while all other primates ...

  6. Family with Down syndrome son went from shock to gratitude ...

    www.aol.com/family-down-syndrome-son-went...

    About 5,700 babies are born with Down syndrome each year in the U.S., and over 400,000 people in the country currently live with it, according to the Centers for Disease Control and Prevention (CDC).

  7. XX male syndrome - Wikipedia

    en.wikipedia.org/wiki/XX_male_syndrome

    XX male syndrome, also known as de la Chapelle syndrome, is a rare intersex condition in which an individual with a 46,XX karyotype develops a male phenotype. [2] Synonyms for XX male syndrome include 46,XX testicular difference of sex development (or 46,XX DSD) [3] [4] [5] [6]

  8. Down Syndrome Tests During Pregnancy: Everything ... - AOL

    www.aol.com/news/prenatal-testing-down-syndrome...

    Here’s what to know about the different types of Down syndrome tests and their effectiveness. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 ...

  9. Polysomy - Wikipedia

    en.wikipedia.org/wiki/Polysomy

    Trisomy 21 – Down syndrome, an example of a polysomy at chromosome 21. Polysomy is a condition found in many species, including fungi, plants, insects, and mammals, in which an organism has at least one more chromosome than normal, i.e., there may be three or more copies of the chromosome rather than the expected two copies. [1]