- A One copy of a chromosome inherited from each parent, as normal
- B Both copies of a chromosome pair from the same parent
- C An entire extra set of chromosomes added to the genome
- D Random, unselective loss of a chromosome during cell division
Correct answer: B. Both copies of a chromosome pair from the same parent
Explanation: UPD: both copies of a chromosome pair inherited from one parent. Can unmask recessive mutations or disrupt imprinted genes (e.g., maternal UPD15 causes Prader-Willi syndrome).
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 →