Answer: Both copies of a chromosome pair from the same parent.
- 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).
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.
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