How can you have three sex chromosomes

Contributing to the early view that XYY syndrome men have serious personality disorders was the case of Richard Speck. Also, there are a variety of sex determination systems used by sexually reproducing life. There is no reason to assume for a fictional species that sex determination is chromosomal. The abnormalities are often hard to recognize at birth and may not be diagnosed until puberty. Click here for the Professional Version. However, mental retardation is not a stable clinical feature of Klinefelter syndrome.
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Triple X syndrome - Wikipedia

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Triple X syndrome

Why did we stop? They are short in stature, averaging 4 foot 7 inches as adults, and often have distinctive webbed necks i. Michael; MacGregor, Thomas N. The X chromosome, being larger, carries many more genes than does the Y. Knox, Richard August 14,
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In most species of animals the sex of individuals is determined decisively at the time of fertilization of the egg, by means of chromosomal distribution. Filamin A is mutated in X-linked chronic idiopathic intestinal pseudo-obstruction with central nervous system involvement. Approximately half of 47,XYY boys identified by newborn screening programs had learning difficulties—a higher proportion than found among siblings and above-average-IQ control groups. Klinefelter syndrome males with more than two X chromosomes usually have extreme symptoms and are often slightly retarded mentally. Education, discipline that is concerned with methods of teaching and learning in schools or school-like….
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The abnormalities are often hard to recognize at birth and may not be diagnosed until puberty. The additional two X chromosomes in males with XXXY syndrome causes them to have 48 chromosomes, instead of the typical Several disorders are known to be associated with abnormal numbers of sex chromosomes. The X chromosome is significantly longer than the Y chromosome and contains hundreds more genes. This process is the most clear-cut form of sex determination. The identification of an individual as either biologically male or female can have legal ramifications for marriage licenses, spousal support and eligibility for parenthood. Tap to switch to the Professional version.
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