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  • (a) What is polygenic inheritance? Explain with the help of a suitable example. (b) How are pleiotrophy and Mendelian pattern of inhertiance different from polygenic pattern of inheritance.  

(a) What is polygenic inheritance? Explain with the help of a suitable example.

(b) How are pleiotrophy and Mendelian pattern of inhertiance different from polygenic pattern of inheritance.

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

Answers (1)

(a) Polygenic inheritance is the type of inheritance in which traits are controlled by three or more genes. For eg: human skin colour and height. The inheritance depends upon the additive as well as the cumulative effect of alleles, as more the number of dominant alleles will be there accordingly the expression of the trait will be more distinct and prominent.

Likewise more the number of recessive alleles will be there, the trait will be diluted and if a member of dominant and recessive alleles are equal then the effect will be intermediate.

(b) Pleiotropy inheritance is that which controls multiple phenotypic expressions through a single gene because it influences several characters simultaneously, is a type of inheritance controlled by one or more genes in which the dominant alleles have a cumulative effect with each dominant allele expressing a part or unit of the trait, the full being shown only when all the dominant alleles are present.

But in Mendelian inheritance, one gene controls only one phenotypic expression as it refers to the expression of monogenic traits. In a pair of alleles, expression of the recessive gene is always masked by the expression of a dominant gene.

Posted by

Priyanka Kumari

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