Question

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

• A. A-I, B - II, C - III, D - IV
• B. A-II, B-I, C - III, D - IV
• C. A-I, B-II, C - IV, D - III
• D. A-II, B-I, C - IV, D - III

Hint:

Break down the prefixes: \textbf{Nulli-} (none, zero) \(\rightarrow\) a whole pair is gone. \textbf{Mono-} (one) \(\rightarrow\) one chromosome is gone. \textbf{Auto-} (self) \(\rightarrow\) multiple genomes from the same species. \textbf{Allo-} (other) \(\rightarrow\) multiple genomes from different species.

Answer 1

The Correct Option is D

Step 1: Concept Overview:
This question assesses understanding of chromosomal variation terminology, specifically aneuploidy (gain or loss of individual chromosomes) and polyploidy (presence of extra chromosome sets).
Step 2: Detailed Explanation:
Matching terms to definitions:


A. Nullisomic: An aneuploid condition characterized by the loss of an entire homologous chromosome pair (2n - 2). Corresponds to II. One chromosome pair missing.

B. Monosomic: An aneuploid condition involving the loss of a single chromosome (2n - 1). Corresponds to I. One chromosome missing.

C. Allotetraploid: A polyploid condition with four sets of chromosomes originating from two or more different species (e.g., AABB, where A and B represent distinct genomes). Corresponds to IV. Two distinct genomes; each has two copies.

D. Autotetraploid: A polyploid condition with four sets of chromosomes derived from a single species (e.g., AAAA, where A represents the basic genome). Corresponds to III. Four copies of the same genome present.

Step 3: Solution:
The correct matches are A-II, B-I, C-IV, D-III.