Q.8 Diploid Drosophila has eight chromosomes. Which one of the following terms should NOT be used to describe Drosophila with sixteen numbers of chromosomes?

• (A) Polyploid
• (B) Aneuploid
• (C) Euploid
• (D) Tetraploid

  Diploid Drosophila has eight chromosomes, so a fly with sixteen chromosomes is tetraploid (4n). This SEO-optimized article answers the MCQ: Which one of the following terms should NOT be used to describe Drosophila with sixteen numbers of chromosomes? (A) Polyploid, (B) Aneuploid, (C) Euploid, (D) Tetraploid—vital for genetics and molecular biology students studying ploidy in model organisms.​

  Correct Answer: Option (B) Aneuploid

  Aneuploid should NOT describe Drosophila with sixteen chromosomes because aneuploidy means abnormal chromosome numbers from nondisjunction (e.g., trisomy 21), not exact multiples of the haploid set.

  Diploid Drosophila (2n=8) becoming tetraploid (4n=16) via endomitosis or cell fusion is euploid—complete sets. Aneuploid implies imbalance like 9 or 10 chromosomes, disrupting gene dosage severely in flies.​

  Explanation of All Options

  Ploidy terms distinguish balanced vs. unbalanced genomes in Drosophila research.

  • (A) Polyploid: Correct term. Encompasses triploid (3n=12), tetraploid (4n=16)—multiples beyond diploid.

  • (B) Aneuploid: Incorrect term. Describes 2n ± whole chromosomes (e.g., 7 or 9), not 4n=16 which is balanced.

  • (C) Euploid: Correct term. Means exact multiples of haploid genome (n=4, 2n=8, 4n=16).

  • (D) Tetraploid: Correct term. Precisely 4n=16 chromosomes (four haploid sets).

  Option	Definition	Applies to 16 Chromosomes?	Usage
  (A) Polyploid	>2n complete sets	Yes (4n)	Correct ​
  (B) Aneuploid	Abnormal count (gain/loss)	No—balanced 4n	NOT used
  (C) Euploid	Exact haploid multiples	Yes (4n=16)	Correct
  (D) Tetraploid	Four haploid sets	Yes (exactly 16)	Correct ​

  Relevance in Genetic Engineering

  Tetraploid Drosophila aids gene dosage studies and polyploidy research, linking to your molecular genetics interests—common in biotech for chromosomal manipulation and fermentation strain engineering.