Is the dominant allele always the most frequent?

A widespread misconception is that traits due to dominant alleles are the most common in the population. While this is sometimes true, it is not always the case. For example, the allele for Huntington’s Disease is dominant, while the allele for not developing this disorder is recessive.

Is the dominant trait always the most common?

Describing a trait as dominant does not mean it is the most common; it means that it is expressed over the recessive trait. For example, tongue rolling is a dominant trait, controlled by the dominant version of a particular gene (R). Individuals with one or two copies of R will exhibit tongue rolling.

Is the dominant allele always the most common allele in the gene pool?

The dominant allele is always the most common allele in the gene pool. … What is the frequency of the recessive allele in a population of 100 individuals with the following genotypes: 30 BB, 60 Bb, 10 bb?

Is anyone dominant for every trait?

No organism has all dominant or all recessive genes. An organism may be pure in certain traits and hybrid others. Remember, that a dominant trait in one kind of organism may be a recessive trait in another organism. 1.

How can a dominant allele be rare?

Rare Dominant Genes

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Some dominant genes are rare, meaning that a small subset of humans have the dominant allele. The polydactyly trait — having extra fingers or toes — is one example of a rare inherited dominant gene trait.

Is genetic flow random?

These include: mutation, random genetic drift and gene flow. … Genetic drift is a random process in which chance plays a role in deciding which gene variants (alleles) survive. Gene flow occurs when genes are carried from one population to another.

Why are recessive conditions more common than dominant ones?

Recessive disease mutations are much more common than those that are harmful even in a single copy, because such “dominant” mutations are more easily eliminated by natural selection.

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