CBSE 2025 · Region 5 · Set 2 · Q9 · 1 mark
Match the terms in Column-I with their description in Column-II and choose the correct option. Column-I (Terms) Column-II (Descriptions) a. Dominance (i) Many genes govern a single character. b. Codominance (ii) In a heterozygote 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.
| Column-I (Terms) | Column-II (Descriptions) |
| a. Dominance | (i) Many genes govern a single character. |
| b. Codominance | (ii) In a heterozygote 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. |
Official answer
From CBSE’s own marking scheme for this paper.
(A)
a-(ii), b-(iii), c-(iv), d-(i)
Principles of Inheritance and VariationPleiotropyRemembermcqeasy
Practice Principles of Inheritance and Variation →All Principles of Inheritance and Variation questions
More from Principles of Inheritance and Variation
- Using a Punnett square workout the distribution of an autosomal phenotypic feature in the first filial…2025 · asked 3×
- By using Punnett square depict the genotypes and phenotypes of test crosses (where green pod colour (G) is…2023 · asked 3×
- Assertion: In dihybrid crosses involving sex-linked genes in Drosophila generation of non-parental gene…2025 · asked 3×
- The following pedigree chart shows the inheritance of a genetic disorder up to three generations of a family.…2023 · asked 3×
- Write the types and locations of the genes causing thalassemia in humans. State the cause and symptoms of the…2026 · asked 3×
- A person with trisomy of 21^ st chromosome shows (i) Furrowed tongue (ii) Characteristic palm crease (iii)…2024 · asked 3×
- The chromosome number is fixed for all normal organisms leading to species specification whereas any…2023 · asked 3×
- A student performed some crosses in plants and represented the result in the form of bar graphs as shown…2026 · asked 3×
CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.