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10 June, 00:22

The two copies or forms of a gene for one trait are called

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  1. 10 June, 02:15
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    The two copies or forms of a gene for one trait are called alleles.

    Explanation:

    Alleles of a gene are formed due to a mutation at same locus of chromosome. Alleles can be a) dominant,

    b) recessive or

    c) null alleles.

    A dominant allele always expresses itself in the phenotype and masks the effect of recessive allele. The recessive allele could express itself only in the absence of dominant allele. A null allele is the one that lacks the normal gene function.
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