List - I List - II A. Haploid I. One chromosome missing B. Allotetraploid II. Two distinct genome and each has two copies C. Monosomic III. Gametic chromosome number D. Trisomic IV. One chromosome extra
Choose the correct answer from the options given below :
Solution: Matching Chromosome Terminology and Definitions
The question requires matching terms related to chromosome number and ploidy (List - I) with their correct definitions (List - II).
Matching Explanation:
- A. Haploid: This term refers to the state of having a single set of unpaired chromosomes. In genetics, it specifically denotes the gametic chromosome number. Therefore, Haploid matches with III. Gametic chromosome number.
- B. Allotetraploid: An allotetraploid is an organism that contains two or more genetic complements derived originally from two different species. Critically, each complement is duplicated. This means it possesses two distinct genomes, with each genome present in two copies. Thus, Allotetraploid matches with II. Two distinct genome and each has two copies.
- C. Monosomic: A monosomic condition occurs in a diploid organism when one chromosome of a homologous pair is missing. This results in a total chromosome number of $2n-1$. Therefore, Monosomic matches with I. One chromosome missing.
- D. Trisomic: A trisomic condition occurs when an organism has three copies of a particular chromosome instead of the usual two. This means there is one extra chromosome compared to the normal diploid set ($2n+1$). Therefore, Trisomic matches with IV. One chromosome extra.
Final Match Summary:
Based on the explanations, the correct matching is:
- A - III
- B - II
- C - I
- D - IV
This corresponds to the option A-III, B-II, C-I, D-IV.
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