What is the inheritance pattern of X-linked traits in males?

The inheritance pattern of X-linked traits in males is characterized by hemizygosity. Males possess one X chromosome and one Y chromosome (XY), meaning they have only one copy of the X chromosome. Therefore, when a male inherits an X-linked trait, he expresses that trait regardless of whether the gene on that X chromosome is dominant or recessive. This is because there is no corresponding allele on the Y chromosome to mask or influence the expression of the X-linked gene.

For instance, if a male inherits an X chromosome carrying a recessive allele for a trait such as color blindness, he will express color blindness because there is not another X chromosome to potentially carry a normal allele. This unique situation where males have just one copy of the X chromosome is referred to as hemizygosity, making them more susceptible to expressing recessive traits linked to the X chromosome.

Other options do not accurately describe the inheritance pattern seen in males regarding X-linked traits. Males cannot be heterozygous for X-linked traits, as this condition requires two X chromosomes with different alleles. Additionally, males only inherit one X chromosome, so they cannot inherit two copies of any X-linked trait. Lastly, males can and do inherit X-linked traits; they