Can Dominant Traits Occur Rarely? Understanding Genetic Prevalence

Discover how dominant traits like polydactyly can be rare despite their genetic dominance.

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Yes, dominant traits can be rare. Dominant traits are not necessarily common in a population. A trait's prevalence depends on various factors, including genetic diversity and environmental influences. For instance, polydactyly (having extra fingers or toes) is a dominant trait but occurs in a small percentage of the population. This rarity results from its specific genetic expression rather than its dominance. Understanding this distinction can clarify how genetic traits are expressed in a given population.

FAQs & Answers

  1. What are examples of dominant traits? Common examples of dominant traits include polydactyly, hitchhiker's thumb, and brown eyes.
  2. How does genetic diversity affect trait prevalence? Genetic diversity can lead to a wider range of traits in populations, impacting the occurrence of dominant traits.
  3. Can a dominant trait be completely absent in a population? Yes, a dominant trait can be absent if the specific alleles are not present in the gene pool due to genetic drift or selective pressures.

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