BioMedical Admissions Test (BMAT) 2026 – 400 Free Practice Questions to Pass the Exam

Polydactyly is classified as autosomal dominant inheritance. This means that only one copy of the mutated gene is necessary for an individual to exhibit the characteristic of polydactyly, which is the presence of extra fingers or toes.

In the context of genetic inheritance, the dominant allele associated with polydactyly can be passed from one generation to the next. If one parent carries the dominant gene, there is a significant chance that their offspring will inherit and express the trait. This is in contrast to conditions that are autosomal recessive, where two copies of the recessive gene are needed to express the trait.

In the case of X-linked recessive inheritance, the trait would primarily affect males, as they have only one X chromosome. Affected males would pass the X-linked allele to their daughters rather than their sons, demonstrating a different pattern of inheritance than what is seen in polydactyly.

Polygenic inheritance involves traits that are influenced by multiple genes and typically shows a range of expressions, such as height or skin color, rather than a straightforward dominant or recessive pattern. This further distinguishes polydactyly, which arises from a single genetic mutation that leads to the clear expression of the trait.