Chromosome Condition 2N-N
2N-N condition of chromosomes reflects-
- Nullisomy
- Monoploidy — Correct Answer
- Monosomy
- Tetraploidy
Explanation:
Correct Answer: Monoploidy
The chromosome condition 2N − N is called Monoploidy — loss of one complete set of chromosomes, resulting in a haploid organism.
Types of Heteroploidy
| Type | Definition | Examples |
|---|---|---|
| Euploidy | Change in number of sets of chromosomes | Monoploidy, Triploidy, Tetraploidy |
| Aneuploidy | Change in number of individual chromosomes in a set | Monosomy, Trisomy, Nullisomy |
Euploidy — Complete List
| Formula | Name | Description |
|---|---|---|
| 2N − N | Monoploidy | Loss of one set (haploid) |
| 2N + N | Triploidy | Addition of one set |
| 2N + 2N | Tetraploidy | Addition of two sets |
Mutation Overview
- Term "mutation" coined by: Hugo de Vries
- Mutation theory proposed in: Oenothera lamarckiana (Evening primrose)
- Chromosomal mutation: Heteroploidy + Chromosomal aberration
- Gene mutation: Substitution + Frame shift mutation
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
