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Chromosome number 2n-1 is an example of

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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>Mutation
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>Mutation
Fruit color in squash is an example of:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation

The best example for pleiotropy is:

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation

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

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
A pleiotropic gene
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
If both parents have AB group, this blood group is not expected in their children.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
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>Mutation

Study the following statements about the blood groups,
A) The genes for Rh antigen are located on somatic chromosome pair-1.
B) Multiple alleles occupy different loci of homologous chromosomes.
C) The expression of blood types in man is by 3 alleles of a single gene.
D) Blood cells of the foetus are destroyed by Ig G type of antibodies.

From the above, identify incorrect statements.

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
Multiple alleles are present:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
If one gene influences many phenotypic traits, the phenomenon is called
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
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>Mutation
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>Mutation
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>Mutation
The phenomenon where more than two alleles exist in a population of an organism at the same locus on the homologous chromosomes is known as
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
If the genotypes determining the blood groups of a couple are IAI0 and IAIB, then the probability of their first child having type O blood is
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
Choose the correct genotypes of parents, who have 50% of their progeny with B blood group
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation
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>Mutation
A gene showing codominance has
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Mutation

Match the following lists:

  List I   List II
A) Change in single base pair of DNA I) Recombination
B) Deletions of base pairs of DNA II) Genetic map
C) Generation of non-parental gene combination III) Point mutations
D) The frequency of recombination between gene pairs on the same chromosome IV) Frame-shift mutations

The correct match is