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Interaction between the alleles of different genes on the same or different chromosome is called

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Important Questions on Principles of Inheritance and Variation

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A gene showing codominance has
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 F2 generation is 1 : 6 : 15 : 20 : 15 : 6 : 1?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
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 express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The genotypes of a Husband and Wife are IA IB and IAi .
Among the blood types of their children, how many different genotypes and phenotypes are possible?
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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

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Multiple alleles are present:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The gene that controls many characters is called
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
If both parents have AB group, this blood group is not expected in their children.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
If one gene influences many phenotypic traits, the phenomenon is called
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Choose the possible genotypes responsible for lightest skin colour in human beings.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

The best example for pleiotropy is:

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The phenomenon where more than two alleles exist in a population of an organism at the same locus on the homologous chromosomes is known as
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
In a cross between true-breeding (homozygous) red-flowered and true-breeding (homozygous) white flowered plants, the F1 progeny was pink. The phenotypic and genotypic ratios in F2 progency were 1:2:1. This is because of:
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
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?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A pleiotropic gene