- March 29, 2008 at 5:07 pm #9362samarParticipant
its my first day over here… 🙂
i just wana ask a question on turner sydrome.In turner syndrom X chromosome is missing..so i want to know X is missingfrom Male or Female? i hope u will help me out.
- March 29, 2008 at 8:42 pm #83116CatParticipant
- March 29, 2008 at 9:01 pm #83117snowcapkParticipantquote samar:
I think the poster above is saying that only a female can have Turner syndrome. (A male embryo with no X chromosomes in unviable.) I can’t tell, but maybe you are asking, "Which gamete (maternal or paternal) fails to provide the X chromosome?" Either gamete can be "responsible": if the egg contains no X chromosome, or if the sperm contains no sex chromosome, the resulting zygote will have Turner syndrome. According to the literature (original reference not identified due to laziness), about 60-80% of Turner syndrome patients have only a maternal X chromsome. The parental origin of the zygote’s X chromosome will determine the phenotype of the disease, probably due to differences in imprinting of genes on the X chromosome.
- March 29, 2008 at 10:18 pm #83123samarParticipant
Thanx for your all replies..it really helped me out.thanks once again…
- March 30, 2008 at 3:13 pm #83132UltrashogunParticipant
Think of it this way: The phenotype "Being a dude" is Y-linked dominant, so what would somebody with the genotype X0 be?
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