Sun February 27, 2011 By: Aarti Prakash

could you please explain in detail with an example what are alleles?

Expert Reply
Mon February 28, 2011
Dear student,
Allele is either of a pair or series of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character. Some alleles are dominant over others.
The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r).

Usually organisms have two alleles for each trait. When the alleles of a pair are heterozygous, one is dominant and the other is recessive. The dominant allele is expressed and the recessive allele is masked. In the above example, round seed shape (R) is dominant and wrinkled seed shape (r) is recessive. Round: (RR) or (Rr), Wrinkled: (rr).
Regards, Team Topperlearning

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