Saturday, October 24, 2009

genetic problem..sos?

this statment is false,explain why!
normal woman whose father was hemophilic and her mother was colorblind,got married to a color blind man they hav a color blind son and a normal daugther.
i know the statement is false,I need an explanation .
Answers:
I don't see how it is false either. I mapped it out, and here's what I got. The eldest lady (grandma) could be XcXc (homozygous for colorblind). Grandpa must be XhY (hemizygous for hemophilia). This makes normal woman XcXh (the Xc would be normal for hemophilia and the Xh normal for color, masking the expression, resulting in normal). Husband must be XcY(hemizygous for colorblind). Son could inherit Xc from mom, thus being Xc (colorblind). Daughter could inherit Xh from mom and must inherit Xc from dad, thus being XcXh (the Xc would be normal for hemophilia and the Xh normal for color, masking the expression, resulting in normal). Please let me know if there is an error.Son cannot be normal; he'd be either Xc or Xh which is either colorblind or hemophilia.
The son would not be colorblind. They'd have both normal children.
it looks like the "normal" woman is a carrier for both hemophilia and color-blindness since her dad was hemophiliac and mother was color-blind. if she and a color-blind man have a son and a daughter, they can be either normal of both traits or have both traits, not just one (since they are both recessive genes).i hope this is correct

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