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(A) The pedigree chart shows that the trait is $X$-linked dominant.$1$. The trait is present in every generation,which is a characteristic of a domina

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Dominant $X$-linked

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(A) The pedigree chart shows that the trait is $X$-linked dominant.$1$. The trait is present in every generation,which is a characteristic of a dominant trait.$2$. An affected father passes the trait to all his daughters but none of his sons,which indicates $X$-linkage.$3$. Since the trait appears in females (who have two $X$ chromosomes) and is passed from an affected father to his daughters,it must be $X$-linked dominant.

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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