controls multiple traits in an individual.

is a gene evolved during Pliocene.

controls a trait only in combination with another gene.

is expressed in only primitive plants.

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A single point mutation in gene 'X' results in breathing difficulty, hypertension as well as partial sterility. Which among the following phenomena best explains the observed phenotypes?

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Important Questions on Principles of Inheritance and Variation

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Define polygenic inheritance.

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

A pleiotropic gene

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in

F_{2}

generation is

1 : 6 : 15 : 20 : 15 : 6 : 1 ?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

What are complementary genes? Explain with the help of an example.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

What is co-dominance?

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

One of the following is quantitative abnormality of polypeptide globin chain synthesis

MEDIUM

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

What is pleiotropy? Give one example of it.

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Match the following

	List - I		List - II
(a)	Holandric genes	(i)	Pleiotropy
(b)	Multiple effects of a single gene	(ii)	Hypertrichosis
(c)	Skin colour in man	(iii)	Multiple Alleles
(d)	$ABO$ Blood types	(iv)	Polygenic inheritance

The correct answer is

EASY

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

If one gene influences many phenotypic traits, the phenomenon is called

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

What are the differences between incomplete dominance and co-dominance? Explain with examples.

HARD

Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Human height is a multigenic character. If the heights of all the individuals living in a metropolis are measured and the percentages of the population belonging to a specific heat are plotted as shown below, which of the plots would represent the most realistic distribution?
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