Because males are hemizygous, or possess only one copy of an X-linked trait, they can be influenced by a single recessive gene when a characteristic is X-linked.
- The X-linked gene allele of a father is passed on to his daughters but not to his sons. When a gene on the X chromosome is mutated, the trait is always displayed in men and in females who are homozygous for the mutation; this pattern of inheritance is known as X-linked recessive inheritance; see also zygosity. Carriers are females who have one copy of the mutant gene.
- Red-green color blindness and hemophilia A: Red-green color blindness are two examples of X-linked recessive diseases. Red-green color blindness is the inability to discriminate between the various red and green hues.
Thus this is why X-linked trait is sufficient for a male to be affected.
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