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NEETZoologyPrinciples of Inheritance and Variation

Are the two alleles always identical in a heterozygote?

Options

  1. AYes, always identical
  2. BNo, they need not always be identical
  3. CYes, except in the F2 generation
  4. DNo, except in the F1 generation

Correct answer

B. No, they need not always be identical

Step-by-step solution

Every gene, as you know by now, contains the information to express a particular trait. In a diploid organism, there are two copies of each gene, i.e., as a pair of alleles. Now, these two alleles need not always be identical, as in a heterozygote. One of them may be different due to some changes that it has undergone (about which you will read further on, and in the next chapter) which modifies the information that particular allele contains

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