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selfstudy selfstudy
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13 years ago
XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?
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#1
13 years ago
In humans, a single copy of the Y chromosome is sufficient to shift development toward normal male phenotype. The extra copy of the X chromosome is simply inactivated. Both mechanisms seem to be all-or-none rather than to be based on concentration levels.
selfstudy Author
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#2
13 years ago
Quote from: biology101 (13 years ago)
In humans, a single copy of the Y chromosome is sufficient to shift development toward normal male phenotype. The extra copy of the X chromosome is simply inactivated. Both mechanisms seem to be all-or-none rather than to be based on concentration levels.

This is helpful, but it does not explain what the observations reveal about the mechanisms and dosage compensation.
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