WHAT IS ROLE OF ALLES HOW …
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Anurag Chauhan 6 years, 7 months ago
A gene is a stretch of DNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene.
An allele is found at a fixed spot on a chromosome. Chromosomes occur in pairs so organisms have two alleles for each gene — one allele in each chromosome in the pair. Since each chromosome in the pair comes from a different parent, organisms inherit one allele from each parent for each gene. The two alleles inherited from parents may be same (homozygous) or different (heterozygotes).
For example, the gene for eye color has several variations (alleles) such as an allele for blue eye color or an allele for brown eyes.
Another important difference between the two is that alleles occur in pairs. They are also differentiated into recessive and dominant categories. Genes do not have any such differentiation.
So, A gene is a part of the DNA. Alleles, on the other hand, refer to different versions or types (like blue, brown etc.) of the same gene.
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