EASY
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The generation produced by crossing two parental organisms is called the second filial generation.

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Important Questions on Principles of Inheritance and Variation

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
'The human ABO blood group is considered a good example of co-dominance and multiple alleles'. Analyse the statement by giving suitable reasons.
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
A child has a blood group O. If the father has blood group A and the mother has blood group B. Work out the genotypes of the parents and the possible genotypes of the other offspring.
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.
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
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?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Mendel's monohybrid ratio is
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?
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
In Drosophila, the size of the wings is controlled by _______ number of multiple alleles.
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
How many types of gametes can be produced by individual with the genotype AAbb?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Which of the following pairs is wrongly matched?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A woman was surprised to observe in her garden red, pink and white Tulip flower plants as she had planted only pink Tulip plants. With a genetic cross, show how such progenies are possible with phenotypes different from the parent plant.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Define test cross and draw diagram.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
What is test cross? Show phenotypic ratio 1:1 in a monohybrid test cross through punnett square.
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
A gene showing codominance has
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