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  4. Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans. The trait traced in the above pedigree chart is

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Q. Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans.
The trait traced in the above pedigree chart isBiology Question ImageBiology Question Image

AIIMSAIIMS 2005Principles of Inheritance and Variation

Solution:

The disease in the given pedigree chart is $X$-linked dominant because, it is inherited by female child from her father and none of the male child is affected ($X$-linked). As disease expressed in female inspite of two $XX$ chromosomes, it will be dominant.