What type of inheritance patterns do sex-linked traits follow?

• A. Autosomal dominant
• B. X-linked inheritance
• C. Codominance
• D. Polygenic inheritance

Answer: (B)

Sex-linked traits primarily follow X-linked inheritance. This means that the genes responsible for these traits are located on the X chromosome. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). Because of this arrangement, sex-linked traits can exhibit different patterns of inheritance in males and females. For example, if a recessive trait is present on the X chromosome, males will express that trait if they inherit the affected X since they only have one copy of the X chromosome. In contrast, females would require two copies of the affected X chromosome to express the trait due to having two X chromosomes.

This pattern of inheritance explains why certain traits, such as color blindness and hemophilia, are more commonly observed in males than females. Understanding this concept is crucial for deciphering genetic patterns related to sex-linked traits and their implications in populations.

The other types of inheritance patterns mentioned do not apply to sex-linked traits. Autosomal dominant inheritance involves traits that are expressed even when only one copy of the gene is present, which is not specific to sex chromosomes. Codominance refers to a situation in which both alleles are expressed equally in the phenotype, such as in the case of certain blood groups. Polygenic inheritance