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Title: Sex Determination Post by: selfstudy on Aug 27, 2012 XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?
Title: Re: Sex Determination Post by: biology101 on Aug 27, 2012 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.
Title: Re: Sex Determination Post by: selfstudy on Sep 5, 2012 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. |