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Dihybrid Cross

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Question

Is it correct to say that polygenic inheritance is the opposite of pleiotropy? As pleiotropy is the phenomena where one gene expresses multiple phenotypes, whereas, many polygenes encode for one single phenotype.

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yes ganesh

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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.

Q. Match the terms in Column I with their description in Column II and choose the correct option:

Column I	Column 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 expresses themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

Q. Match the terms in Column I with their description in Column II and choose the correct option :

	Column I		Column II
(1)	Dominance	(i)	Many genes govern a single character
(2)	Codominance	(ii)	In a heterozygous organism only one allele expresses itself
(3)	Pleiotropy	(iii)	In a heterozygous organism both alleles express themselves fully
(4)	Polygenic inheritence	(iv)	A single genes influences many characters

Q. Match the terms in Column I with their description in Column II and choose the correct option :

	Column I		Column II
(1)	Dominance	(i)	Many genes govern a single character
(2)	Codominance	(ii)	In a heterozygous organism only one allele expresses itself
(3)	Pleiotropy	(iii)	In a heterozygous organism both alleles express themselves fully
(4)	Polygenic inheritence	(iv)	A single genes influences many characters

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]

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