Answer: Watson and Crick (1953).
- A Mendel and Morgan
- B Watson and Crick (1953)
- C Avery, MacLeod, McCarty
- D Hershey and Chase
Correct answer: B. Watson and Crick (1953)
Explanation: Watson and Crick proposed the double helix structure of DNA in 1953, using X-ray data from Rosalind Franklin.
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →