1.

Differentiate between multiple allelism and pleiotropy with the help of an example of each.

Answer»
Multiple allelismPleiotropy
  • It is the phenomenon in which a gene for a trait exists in more than two allelic forms.
  • The alleles can show codominance.

e.g. The gene for human blood groups exists in three allelic forms, IA ,IB and Io

  • It is the phenomenon of the ability of a single gene to have more than one phenotypic effect.
  • Codominance is not exhibited

e.g. a single gene in garden pea controls seed shape and size of starch grains.



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