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Principles of Inheritance and Variation
Mendel's Law of Dominance
2 questions from 2 papers, each with its answer.
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- years asked, 2017–2026
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- of Principles of Inheritance and Variation
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Concepts tested
- Expression of a dominant allele
- Statements explainable by the law of dominance
All Questions
2024 1 question
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Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the characters appear as such in F2 generation. C. Factors occur in pair in normal diploid plants. D. The discrete unit controlling a particular character is called factor. E. The expression of only one of the parental characters is found in a monohybrid cross. Choose the correct answer from the options given below:The Law of Dominance explains that characters are controlled by discrete units called factors (D), that factors occur in pairs in normal diploid plants (C), that of a pair of dissimilar factors one is dominant and the other recessive (A), and that only one of the parental characters is expressed in a monohybrid cross (E). Statement B is not explained by the law of dominance. So A, C, D and E only are correct.
2002 AIPMT 1 question
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A gene is said to be dominant if : -A dominant allele expresses its character whether it is present in two copies (homozygous, TT) or in one copy along with a recessive allele (heterozygous, Tt).
For example, tall (T) in pea: both TT and Tt plants are tall.
A recessive allele, in contrast, is expressed only in the homozygous condition (tt).
So a gene is said to be dominant if it is expressed both in the homozygous and the heterozygous condition.