Class 12 Biology: Principles of Inheritance and Variation

This worksheet tests your understanding of fundamental concepts in inheritance and variation, including Mendelian genetics, incomplete dominance, codominance, and genetic disorders.

Class 12CBSEBiologymediumPractice

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Q1. Which of the following is an example of incomplete dominance?
- ABO blood groups in humans
- Flower color in Mirabilis jalapa (4 o'clock plant)
- Coat color in cattle (Roan)
- Sickle cell anaemia
Q2. If a dihybrid cross is performed between two heterozygous individuals (AaBb x AaBb), what will be the phenotypic ratio in the F2 generation?
- 3:1
- 9:3:3:1
- 1:2:1
- 1:1
Q3. The phenotypic expression of all the genes present in an individual is called its ____.
Q4. Turner’s syndrome is caused by the loss of a ____ chromosome.
- single autosome
- single X
- single Y
- pair of autosomes
Q5. Distinguish between a test cross and a back cross.

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