What is a Sex Linked Trait? A trait genetically determined by an allele located on the sex chromosome. |
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Since traits are sex linked, there is usually a distinct pattern. Color blindness is a sex-linked trait whose allele is recessive and located on the X chromosomes. symptoms include trouble seeing red, green, or blue or a mix of these colors. The Prognosis is Hereditary forms of color blindness do not change during a person's lifetime. In cases where color blindness was not inherited, the disorder may gradually become more or less severe over time. When the mother is color blind and the father is not:
When the father is color blind and the mother is not:
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X-inactivation: is a process by which one of the two copies of the X chromosomes present in female is inactivated. The inactive X chromosome is silenced by it being packaged in such a way that it has a transcriptionally inactive structure. As females have two X chromosomes, X-inactivation causes them not to have twice as many X chromosome gene products as males, which only possess a single copy of the X chromosome. The choice of which X chromosome will be inactivated is random in humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism.
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