What type of gene is considered recessive and located only on the X chromosome?

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A gene that is considered recessive and located only on the X chromosome is referred to as X-linked. This means that the trait controlled by the gene is expressed predominantly in males, who have only one X chromosome. Females have two X chromosomes and can be carriers of the trait. When a female is heterozygous for the X-linked trait, she may pass the gene to her sons, who have a 50/50 chance of expressing the trait.

What Type of Gene Is Considered Recessive and Located Only