Kundali IQHome › Exam notes › UPSC Civil Services › Cell & Genetics
Cell & Genetics
Science & Technology
Useful for: UPSC Civil Services
Overview
Cells carry genetic information in DNA; genetics explains inheritance and underpins modern tools such as genome sequencing and gene editing.
Key points
- DNA’s double-helix structure was described by Watson and Crick (1953).
- RNA contains uracil instead of thymine.
- Humans normally have 46 chromosomes (23 pairs).
- Mitochondrial DNA is inherited from the mother.
- Haemophilia is X-linked; sickle-cell anaemia is an autosomal recessive disorder.
- CRISPR-Cas9 gene editing earned the 2020 Nobel Prize in Chemistry (Charpentier and Doudna).
Practice MCQs
From the perspective of definition and scope, which one of the following statements about Cell & Genetics is correct?
- Cell & Genetics has no exceptions or limitations in exam analysis.
- DNA stores hereditary information, while RNA performs diverse informational and functional roles.
- Every cell in a multicellular organism expresses every gene at the same level at all times.
- Cell & Genetics is unrelated to institutions, processes or real-world applications.
Read chapter notes · Similar questions
Show answer
Answer: (b) DNA stores hereditary information, while RNA performs diverse informational and functional roles.. DNA stores hereditary information, while RNA performs diverse informational and functional roles.
Consider the following statements on Cell & Genetics, focusing on definition and scope: 1. DNA stores hereditary information, while RNA performs diverse informational and functional roles. 2. Every cell in a multicellular organism expresses every gene at the same level at all times. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (a) 1 only. Statement 1 is correct; Statement 2 is a common misconception.
More topics in this chapter
Notes and questions are written by Kundali IQ for practice. They are not official papers; always check the latest official notification for the syllabus and pattern.