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In Drosophila, the allele for normal grey body colour (G) is dominant to the ebony body (g). The following table summarises the results of several crosses:

Cross Result
Strain 1 × gg All Grey type
Strain 2 × gg 1 Grey : 1 ebony
Strain 3 × gg All ebony type
Strain 4 × Gg 3 Grey : 1 ebony

Which strains have the genotype Gg ?

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Important Questions on Principles of Inheritance and Variation

MEDIUM
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
EASY
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:
EASY
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?
MEDIUM
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:

MEDIUM
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.
MEDIUM
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?
MEDIUM
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?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Alleles are:
EASY
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.
MEDIUM
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?
EASY
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?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Who is known as the father of Genetics?
EASY
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?
EASY
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
EASY
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:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
According to Mendel, ........................ segregate and ..................... assort independently.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A true breeding plant is:
EASY
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
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A gene showing codominance has
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Which of the following pairs is wrongly matched?