Answer: O.
- A A
- B B
- C AB
- D O
Correct answer: D. O
Explanation: Blood type O negative has no A or B antigens. It can be donated to anyone (universal donor). AB is the universal recipient.
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 →