Discussions By Condition: Rare Disases

XY Chromosomes

Posted In: Rare Disases 1 Replies
  • Posted By: Anonymous
  • October 10, 2006
  • 02:13 AM

Why is an X linked recessive gene more likely to exert effects on males than on females??
A)Is it because males only have one X chromosome? or
B)Genes on the X chromosome are sex-linked?

Color blindness...
A man with normal color vision and a woman whose father was colored blind have children.
Will all children have normal vision or will some percentage of male or female children be color blind??

thanks for any help

JenX

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  • hi. usually (from what ive studied) its becuse of the 2x being stronger than 1x.my family has fragile x (genetic disorder). the girls with it are mostly normal to moderately affeccted, the boys are retarded, autistic and severely disabled. with us- they said that the x chromosome has an impact on specific nutrients needed for proper brain functioning. the boys only have one x and it doesnt work- so the brain doesnt get what it needs. because the girls have 2 x's, the good one can "rule out" the bad one or at minimum- provide more than it could with only a single bad x. The mutation is only on the X chromosome- not the Y, so it is sex-linked, as the man can only give one or the other, Y for a boy or X for a girl. If the man has fragile x- his daughters will have it (they got his X) his boys will not (Y) If a woman has fragile x, she can give a child a good X or a bad X. 50/50 chance. so she can give it to both a son or a daughter. mom always gives 1 X----- dad has X or Ychild is either XX=girl or XY boy hope this helps. (interesting at least)
    kamsae 88 Replies
    • January 30, 2007
    • 05:39 AM
    • 0
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