Which statement describes autosomal dominant inheritance?

Which statement describes autosomal dominant inheritance?

• A. Both parents must contribute a dominant allele for expression
• B. One copy of a dominant allele is sufficient to express the trait
• C. Recessive traits can skip generations
• D. It results in a 50% chance of expression in every generation

Answer: (B)

The statement that one copy of a dominant allele is sufficient to express the trait accurately describes autosomal dominant inheritance. In this mode of inheritance, an individual only needs to inherit a single dominant allele from one parent to exhibit the associated trait or condition. This characteristic is fundamental to understanding how traits are passed on in families and why certain disorders can appear in a child's phenotype even if one parent is unaffected. For instance, in conditions like Huntington's disease, just one copy of the mutated gene is enough to cause the disorder. This contrasts with autosomal recessive inheritance, where two copies of a recessive allele are needed for the trait to manifest. The clear distinction lies in the fact that dominant alleles can overpower the effects of recessive alleles, which leads to the observed trait appearing in individuals with only one dominant allele. In terms of inheritance patterns, the other statements do not align with the principles of autosomal dominant inheritance. While recessive traits can skip generations, this is not a characteristic of dominant traits; rather, recessive traits often remain hidden in carriers. Also, while there is a 50% chance of having a child express a dominant trait when one parent carries the allele, this does not define the inheritance; rather, it's a probability

The statement that one copy of a dominant allele is sufficient to express the trait accurately describes autosomal dominant inheritance. In this mode of inheritance, an individual only needs to inherit a single dominant allele from one parent to exhibit the associated trait or condition. This characteristic is fundamental to understanding how traits are passed on in families and why certain disorders can appear in a child's phenotype even if one parent is unaffected.

For instance, in conditions like Huntington's disease, just one copy of the mutated gene is enough to cause the disorder. This contrasts with autosomal recessive inheritance, where two copies of a recessive allele are needed for the trait to manifest. The clear distinction lies in the fact that dominant alleles can overpower the effects of recessive alleles, which leads to the observed trait appearing in individuals with only one dominant allele.

In terms of inheritance patterns, the other statements do not align with the principles of autosomal dominant inheritance. While recessive traits can skip generations, this is not a characteristic of dominant traits; rather, recessive traits often remain hidden in carriers. Also, while there is a 50% chance of having a child express a dominant trait when one parent carries the allele, this does not define the inheritance; rather, it's a probability