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A Mendel's law which does not have an exception is

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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>Inheritance of One Gene
A gene showing codominance has
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
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
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
If the gene pool of the locus X in the human genome is 4, then what would be the highest possible number of genotypes in a large population?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Which one of the following pairs of genotype and phenotype ratios will be obtained in F2 generation for Snapdragon plants exhibiting incomplete dominance for red and white flower color traits?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
In human beings, brown eye (B) is dominant over blue eye (b). A brown-eyed couple has a blue-eyed child. What are the possible genotypes of the couple?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
How many types of gametes can be produced by individual with the genotype AAbb?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Which one of the following genetic phenomena is represented by the blood group AB?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A true breeding plant is:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
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>Inheritance of One Gene
What is the possible genotypic ratio in F2 generation if a plant producing red flowers RR is crossed with another plant of the same species that produces white flowers rr?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
The production of gametes by the parents, formation of zygotes, the F1 and F2  plants, can be understood from a diagram called:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
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>Inheritance of One Gene
Which of the following pairs is wrongly matched?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene

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>Inheritance of One Gene
Alleles are:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene

Match the following lists:

  List - I   List - II
(A) Back cross   It is the genetic make up of an individual.
(B) Test cross (II) An individual is having two different alleles for a single character. Consequently, it will produce two different types of gametes with reference to a gene.
(C) Heterozygote (III) An individual is having two similar or identical alleles for a single character. Hence, it will produce only one kind of gametes with reference to a gene.
(D) Homozygote (IV) If the F1 progeny are mated back to one of their parents.
    (V) The cross between F1 progeny (or heterozygotes) and their recessive homozygous parent.

The correct match is:

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
According to Mendel, ........................ segregate and ..................... assort independently.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
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:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio