MEDIUM
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In a genetic cross having recessive epistasis F2 phenotypic ratio would be
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Important Questions on Principles of Inheritance and Variation
EASY
The best example for pleiotropy is:
MEDIUM
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
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
EASY
If both parents have AB group, this blood group is not expected in their children.
MEDIUM
A pleiotropic gene
EASY
A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are
EASY
Fruit color in squash is an example of:
EASY
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
MEDIUM
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
EASY
Multiple alleles are present:
EASY
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) | Blood types | (iv) | Polygenic inheritance |
The correct answer is
MEDIUM
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
If one gene influences many phenotypic traits, the phenomenon is called
HARD
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?
EASY
In a cross between true-breeding (homozygous) red-flowered and true-breeding (homozygous) white flowered plants, the progeny was pink. The phenotypic and genotypic ratios in progency were . This is because of:
MEDIUM
Choose the correct genotypes of parents, who have of their progeny with blood group
HARD
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.
EASY
According to Mendel, ........................ segregate and ..................... assort independently.
EASY
A gene showing codominance has
EASY
In a diploid organism, when the locus X is inactivated by locus Y, transcription of the locus Y is triggered. Based on this observation, which one of the following statements is CORRECT?
