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What is a lethal gene?

Important Questions on Principles of Inheritance and Variation

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
A gene showing codominance has
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
Point mutation is caused in which of the following diseases?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
A pleiotropic gene
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
A change of single base pair in the gene for beta globin chain (in human haemoglobin) that results in the change of amino acid residue glutamine to valine which is due to
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

The best example for pleiotropy is:

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

Statement (S): The heterozygous individuals for sickle-cell anaemia HbAHbS express disease phenotype and also carriers of the disease.

Reason (R): HbAHbS genotype individuals are resistant to severe effects of malaria.

The correct answer is

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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>Deviations from Mendelism
Select the correct match.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
For a particular gene that determines the coat color in a diploid organism, there are three different alleles that are codominant. How many different skin colors are possible in such an organism?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
Mutation in a single gene can lead to changes in multiple traits. This is an example of
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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>Deviations 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>Deviations 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:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism

ABO blood type in man is an example of

1. Pleiotropy

2. Incomplete dominance

3. Co-dominance

4. Multiple allelism

Select the code for the correct answer from the options given below:

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
Which one of the following genetic phenomena is represented by the blood group AB?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations from Mendelism
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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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MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviations 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