Science
Dominant Allele Explained
Discover the power of a dominant allele in genetics. Learn how this single gene variant expresses its trait over its recessive counterpart.
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What is it?
A dominant allele is a gene version that expresses its trait over a recessive allele. We get two alleles for each gene, one from each parent. If a dominant allele is present, its characteristic appears. For instance, the brown-eye allele is dominant; someone with one brown-eye and one blue-eye allele will have brown eyes. Blue eyes require inheriting two recessive alleles. This principle explains how certain traits are passed down through families.
Why is it trending?
Dominant alleles are trending due to the popularity of at-home DNA tests. People are curious about their genetic traits and health risks, driving interest in foundational genetics. This concept is central to understanding heredity, making it relevant in discussions about ancestry, personalized medicine, and gene-editing. It bridges complex science with personal identity, keeping it a hot topic.
How does it affect people?
Dominant alleles determine many physical traits, like freckles and dimples. They also have critical health implications. Some genetic disorders, like Huntington's disease, are caused by a single dominant allele, meaning inheriting one copy causes the condition. This knowledge is vital for genetic counseling, helping people make informed decisions about family planning and their risk for hereditary conditions.