mutations
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A permanent heritable change in an allele that produces a different variant of the same trait is called a mutation. Mutations can lead to genetic diversity within a population and are the raw material for evolution.
so after it changes it is called a gene
A chromosomal mutation is a change in the structure or number of a chromosome. This can involve rearrangements, deletions, duplications, or inversions of genetic material within a chromosome. These mutations can lead to genetic disorders or affect an individual's development and health.
A Mutation
This is called genetic recombination or crossing over. It results in the exchange of genetic material between homologous chromosomes during meiosis, leading to genetic diversity in offspring.