Which one of the following statements is incorrect?
Alleles are different forms of the same gene.
Alleles are present at the same locus.
Alleles code for different isoforms of a protein.
Alleles are non-heritable.
Correct answer: (d)
Solution: Alleles are two alternative forms of the same gene. They are present at the same locus on a chromosome. These are heritable. In an offspring, one allele is inherited from father and the other one is inherited from mother. They code for different isoforms of a protein. They are either dominant or recessive. Dominant allele produces dominant phenotype and requires only one copy to express itself. Recessive allele requires two copies to express itself.