In humans, the gene from normal blood clotting. H, is dominant to the gene for haemophilia,h. This is a sex-linked trait found of the X chromosome. A woman with normal blood clotting has four children. They are: a normal son, a haemophilic son, and 2 normal daughters. The father has normal blood clotting. What is the probable genotype of each member of the family?
Sex-Linked problems?
Parents: XHY father XHXh Mother
Children: XHY son, XhY son, XHXH 1 possible daughter (normal), XHXh (carrier) 1 possible daughter.
Now normal refers to XHXH. XHXh is not normal but a carrier.
Reply:Mom, Hh; Dad, H-; Son1, H-, Son2, h-; Daughters, Hh or HH.
Reply:the Father has a YH genotype, the Mother has a Hh, the normal son has a YH the haemophilis son has a Yh and the two normal daughters are HH or Hh. This is refered to as a pedigree chart
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