Genetics as it applies to evolution, molecular biology, and medical aspects.
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I have a problem which corresponds to the pedigree analysis. There is a disease which is inherited by X-linked recessive. The problem is that the father is affected (XaY) and the mother is homozygote (XAXA). They have 4 children, 2 sons and 2 daughters. The sons are not affected (XAY) and one of the daughter is affected (XaXA). The other daughter is not affected. The problem is that she should be affected but she isn´t. What could be the possible cause of that??
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