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BiologyTopic Question Bank50+ Solved MCQsUpdated October 2026👁️ 3.8k Topic Views

Principles of Inheritance and Variation Questions & Answers

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Practice Questions for Principles of Inheritance and Variation

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Assertion (A): When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the non-parental type. Reason (R): Higher parental gene combinations can be attributed to crossing over between two genes.

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Principles of Inheritance and Variation Questions & Answers

Principles of Inheritance and Variation — Key Concepts & Shortcuts

Practice Questions for Principles of Inheritance and Variation

Assertion (A): When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the non-parental type. Reason (R): Higher parental gene combinations can be attributed to crossing over between two genes.

Which of the following statements is NOT true for two genes that show a 50% recombination frequency?

The 'position effect', where the expression of a gene is altered due to a change in its physical location on the chromosome, is frequently a result of which structural aberration?

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of a pregnancy resulting in an affected child?

Which of the following is an INCORRECT statement with regard to Haemophilia?

Which Mendelian extension idea is depicted by a cross in which the F1 generation resembles both the parents?

Which of the following cannot be detected in a developing foetus by amniocentesis?

What is the genotypic ratio of a Mendelian monohybrid cross in the F2 generation?

What is the pattern of inheritance for a polygenic trait?

Amniocentesis is a prenatal diagnostic test that can detect chromosomal abnormalities. Which of the following conditions CANNOT be detected by amniocentesis?

Mendel would not have been able to explain the Law of Independent Assortment if _______ was known at his time and the genes were closely located.

In Mendel's experiments, which of the following examples illustrates pleiotropy, where a single gene controls two different phenotypic traits?

Phenotypic males with an XX genotype and phenotypic females with an XY genotype are sometimes observed due to:

Cytoplasmic inheritance is often called maternal inheritance because:

When a monohybrid cross results in a 1:2:1 ratio for both genotype and phenotype in the F2 generation, it indicates which genetic phenomenon?

Pea plants (Pisum sativum) were primarily selected for Mendel's experiments because:

From a biological and medical standpoint, which of the following marriage combinations carries a significant risk of erythroblastosis fetalis and should be medically counselled against?

Given below are two statements: Statement I: Phenylketonuria is an example of pleiotropy. Statement II: Affected individuals lack an enzyme that converts phenylalanine into tyrosine. In the light of the above statements, choose the most appropriate answer from the options given below:

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