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An allele [1], or allelomorph, is a ... A notable example of this is Gregor Mendel's discovery that the white and purple flower colors in pea plants were the result ...
Allele frequency, or gene frequency, is the relative frequency of an allele ... Example. Consider a locus that carries two alleles, A and B.
The allele frequency spectrum can be written as the vector = (,,,,), where is the number of observed sites with derived allele frequency .In this example, the observed allele frequency spectrum is (,,,,), due to four instances of a single observed derived allele at a particular SNP loci, two instances of two derived alleles, and so on.
These are closely linked allele within which crossing over occur. They affect the same character. Example: Red eye colour of Drosophila has different mutants like white and apricot. They affect pigmentation i.e., affect the same character. So, they are allelic. They can undergo recombination, i.e., they are nonallelic.
In the example on the right, both parents are heterozygous, with a genotype of Bb. The offspring can inherit a dominant allele from each parent, making them homozygous with a genotype of BB. The offspring can inherit a dominant allele from one parent and a recessive allele from the other parent, making them heterozygous with a genotype of Bb.
The allele for antibiotic resistance then becomes a fixed allele within the surviving and future populations. This is an example of the bottleneck effect . A bottleneck occurs when a population is put under strong selective pressure, and only certain individuals survive.
Genes may possess multiple variants known as alleles, and an allele may also be said to reside at a particular locus. Diploid and polyploid cells whose chromosomes have the same allele at a given locus are called homozygous with respect to that locus, while those that have different alleles at a given locus are called heterozygous. [3]
In population genetics, gene flow (also known as migration and allele flow) is the transfer of genetic material from one population to another. If the rate of gene flow is high enough, then two populations will have equivalent allele frequencies and therefore can be considered a single effective population.