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Why Everyone Is Different

Genetic variation is the diversity in gene frequencies between individuals or populations. It is maintained by mechanisms like natural selection and mutation, and it is critical for evolutionary adaptation.

What It Is

Genetic variation is the variation in the order of nucleotides in DNA. It can be measured by looking at polymorphic gene loci or the percentage of heterozygous individuals in a population.

How It Works

Mechanisms include small-scale sequence variations (like base-pair substitutions) and large-scale structural variations (like chromosomal rearrangements). Processes like meiosis and random fertilization ensure these variations are passed on.

Why It Matters

It provides the raw material for natural selection. Balanced polymorphisms can maintain variation even when some alleles are harmful, ensuring the population remains resilient.

Discovery & History

The study of heritable variation predates modern molecular genetics. 18th-century scholars explored these concepts long before the discovery of the DNA molecule or the sequencing of the genome.

Real-World Examples

In RNA viruses like HIV or SARS, rapid genetic recombination and high mutation rates allow the viruses to evolve quickly, posing challenges for medical treatment and immunity.

Go deeper

Frequently Asked Questions

What is genetic variation?+
Genetic variation is the diversity in gene frequencies between individuals or populations.
Why is genetic variation important?+
It is critical for evolutionary adaptation.
How is genetic variation maintained?+
It is maintained by mechanisms like natural selection and mutation.
What mechanisms maintain genetic variation?+
Mechanisms such as natural selection and mutation help maintain genetic variation.
Where does genetic variation occur?+
Genetic variation occurs between individuals or populations.
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