The phenomenon in which a single gene expresses different phenotypic characteristics or traits is known as Pleiotropy. The multiple effects of a single gene can be seen in different body tissues showing different phenotypic characteristics. For example- Phenylketonuria (PKU) is a disease that causes mental retardation and reduced hair and skin pigmentation. These effects are caused by the same gene.

Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 1

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What is pleiotropy?

Important Questions on Genetics

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 2

What are the antigens causing 'ABO' blood grouping? Where are they present?

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 3

What are the antibodies of 'ABO' blood grouping? Where are they present?

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 4

What are multiple alleles?

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 5

What is erythroblastosis foetalis?

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 6

A child has blood group 'O'. If the father has blood group 'A' and mother has blood group 'B', work out the genotypes of the parents and the possible genotypes of the other offspring.

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 7

What is the genetic basis of blood types in ABO system in man?

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Intermediate Second Year Zoology>Chapter 11 - Genetics>QUESTIONS>Q 8

What is polygenic inheritance?

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