Respuesta :

Answer:

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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