Final answer:
X-linked inheritance is the pattern where males inherit one allele and females inherit two. An example is red-green color blindness.
Step-by-step explanation:
The pattern of inheritance that involves traits for which males inherit only one allele and females inherit two is called X-linked inheritance. In humans, females have two X chromosomes and males have one X and one Y chromosome. Genes that are present on the X but not the Y chromosome are said to be X-linked. This means that males only inherit one allele for the gene, and females inherit two alleles.
An example of a trait that follows X-linked inheritance is red-green color blindness. This trait is caused by recessive alleles on the X chromosome. Since males have only one X chromosome, they will express the trait if they inherit the recessive allele. Females, on the other hand, need to inherit two recessive alleles to express the trait.