Which inheritance pattern affects both sexes equally and is present in every generation?

The inheritance pattern that affects both sexes equally and is present in every generation is autosomal dominant. This means that if an individual has a dominant allele for a trait, they will express that trait regardless of whether the other allele is dominant or recessive.

In autosomal dominant inheritance, the trait can be observed in both males and females equally because it is not linked to sex chromosomes. This pattern typically manifests in every generation, meaning that the trait can be passed from one generation to the next without skipping generations. If one parent carries the dominant allele, there is a 50% chance for each child to inherit the trait.

In contrast, X-linked recessive traits tend to be more frequently expressed in males because males have only one X chromosome, while females have two. This can lead to the skipping of generations. Y-linked traits are only passed from fathers to sons, thus affecting only males directly. Autosomal recessive traits can be present in carriers without being expressed, which may lead to the trait skipping generations as well if two carriers pass it to their offspring.

Hence, the pattern of autosomal dominant inheritance is characterized by its equal effect on both sexes and its consistent presence across generations.