BotanyWhich one of the following statements is correct with respect to unmodified and modified alleles of a gene?

Which one of the following statements is correct with respect to unmodified and modified alleles of a gene?

  1. A

    In most of the cases the modified allele produces the same phenotype or trait as produced by an unmodified allele.

  2. B

    In no case the modified allele could produce gene product.

  3. C

    In most of the cases the modified allele produces the different phenotype or trait than the one produced by unmodified allele.

  4. D

    Modified allele is usually a dominant allele.

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    Solution:

    A modified allele has modification in the base sequence when compared with the unmodified allele. In most of the cases, there is no change in the production of phenotype or trait. But in some cases, there is change in the phenotype produced by modified allele either due to the formation of less functional product or non-functional product or no product. A modified allele in most of the cases is recessive because when both modified and unmodified alleles are present in a heterozygous individual only the phenotype influenced by unmodified allele is expressed and the modified allele is masked.

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