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In a plant, red flower colour is dominant over white, tall stem is dominant over dwarf and round seed shape is dominant over wrinkled. A plant that is heterozygous for all three characters was allowed to self-fertilize. What is the proportion of the offspring expected to be homozygous for red flower colour, homozygous for tall stem and heterozygous for seed shape?

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Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
A gene showing codominance has
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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>Mendel's Laws of Inheritance
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?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
How many types of gametes can be produced by individual with the genotype AAbb?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
Which one of the following genetic phenomena is represented by the blood group AB?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance

In mice black coat color (allele 'B') is dominant to brown coat color (allele 'b'). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats ?

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
The production of gametes by the parents, formation of zygotes, the F1 and F2  plants, can be understood from a diagram called:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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>Mendel's Laws of Inheritance
Which of the following pairs is wrongly matched?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance

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:

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
Assertion (A): Two copies of the gene are the two allelic forms of which, one allele produces a non-functional enzyme.
Reason (R): The modified allele is generally the recessive allele.
The correct option among the following is:
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
F1 progeny of pea plant bearing violet flowers and snapdragon plant bearing red flowers were selfed to produce their respective F2 progeny. Compare the phenotype, genotype and pattern of inheritance of their respective F2 progeny.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
The ratio of long-winged and vestigial winged Drosophila are formed when a pure long-winged (dominant) and a pure vestigial winged (recessive) Drosophila are crossed:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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>Mendel's Laws of Inheritance
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mendel's Laws of Inheritance
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