iii) X -linked traits in humans

X-linked traits are traits that are encoded by genes on the X chromosome, one of the two sex chromosomes in humans. Since females have two X chromosomes and males have one X and one Y chromosome, X-linked traits can be expressed differently in males and females.

In humans, X-linked traits can be either dominant or recessive. If a trait is dominant, it will be expressed in individuals who inherit only one copy of the mutant allele, regardless of their sex. If a trait is recessive, it will only be _____ ______ _____ ____ _______ ______ ____ __________.
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