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15 Cards in this Set
- Front
- Back
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What can lead to abnormal numbers of sex chromosomes?
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Nondisjunction in meiosis
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Which upsets genetic balance more, an abnormal number of sex chromosomes or autosomes?
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Autosomes
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Is the Y chromosome big or small? Does it carry more or fewer genes?
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Small and fewer
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What happens if a male is born with an extra X chromosome (XXY)?
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Small testes, sterility, breast enlargement and feminine features
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What genetic code is Turner syndrome related with?
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XO
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What genetic code is Klinefelter syndrome related with?
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XXY, XXYY, XXXY, or XXXXY
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What happens in XXXY or XXXXY compared to XXY or XY?
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More mental retardation
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What are the effects of an extra Y chromosome (XXY) in a male?
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No apparent disorders, but they tend to be taller
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What are the effects of an extra X chromosome (XXX) in a female?
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Limited fertility but are otherwise normal
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What are metafemales?
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Females with an extra X chromosome
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What does the O in XO indicate?
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Simply the abscence of a Y chromosome
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What are characteristics of XO females?
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Web of skin b/w neck and shoulders, Shorter, poor breast development and ovary development, constriction of aorta
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What is the affect of XO on intelligence?
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No effect
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In general, what is the effect of a Y chromosome?
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Produces "maleness"
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In general, what is the effect of the absence of a Y chromosome?
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Produces "femaleness"
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