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Polygenic Disorders & Mitochondrial Disorders

Differentiate...

Question

Differentiate between.
Pleiotropy and polygenic inheritance

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Solution

The ability of a gene to influence more than one traits is called pleiotropy whereas in polygenic inheritance the inheritance is influenced by a number of independent genes, each having a small and similar effect. The effect of Several genes is additive.

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Q. Five Mark Questions :
(a) What is polygenic inheritance? explain with the help of a suitable example.
(b) How are pleiotropy and Mendelian pattern of inheritance different from polygenic inheritance?

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

(b) How are pleiotropy and Mendelian pattern of inheritance different from polygenic pattern of inheritance ? [5]

Q. How do incomplete dominance, codominance, polygenic inheritance and pleiotropy, deviate from Mendel's observation?Give an example of each.

Q. (a) Explain polygenic inheritance and multiple allelism with the help of suitable examples.

(b) "Phenylketonuria is a good example that explains Pleiotropy." Justify. [5]

Q. Match the columns and choose the correct option

	I		II
(a)	Dominance	(i)	Many genes govern a single character
(b)	Codominance	(ii)	In a heterozygous organism only one allele expresses itself
(c)	Pleiotropy	(iii)	In a heterozygous organism both alleles express themselves fully
(d)	Polygenic inheritance	(iv)	A single gene influences many characters.

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Polygenic Disorders & Mitochondrial Disorders

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