Question:
Study the following statements regarding genic balance theory and identify incorrect statements:
A) The production of gametes with abnormal number of chromosomes is due to non-disjunction.
B) In Drosophila 'XO' males produce motile sperms.
C) Sex index < 0.5 indicates intersexes in Drosophila.
D) 'Y' chromosome in Drosophila lacks testis determining factor.
Study the following statements regarding genic balance theory and identify incorrect statements:
A) The production of gametes with abnormal number of chromosomes is due to non-disjunction.
B) In Drosophila 'XO' males produce motile sperms.
C) Sex index < 0.5 indicates intersexes in Drosophila.
D) 'Y' chromosome in Drosophila lacks testis determining factor.
Show Hint
In Drosophila, XO is a sterile male; the Y chromosome is for fertility only.
Updated On: Jun 6, 2026
- A & C
- A & D
- B & C
- B & D
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Sex determination in Drosophila.
Step 2: Meaning
Evaluating Bridges' Genic Balance Theory.
Step 3: Analysis
A is correct (non-disjunction causes aneuploidy). B is incorrect; XO Drosophila males are sterile and do not produce motile sperm. C is incorrect; a sex index < 0.5 indicates male (not intersex), and 0.5-1.0 indicates intersex. D is correct; the Y chromosome in Drosophila is not testis-determining. Thus, B and C are incorrect.
Step 4: Conclusion
Statements B and C are incorrect.
Final Answer: (C)
Sex determination in Drosophila.
Step 2: Meaning
Evaluating Bridges' Genic Balance Theory.
Step 3: Analysis
A is correct (non-disjunction causes aneuploidy). B is incorrect; XO Drosophila males are sterile and do not produce motile sperm. C is incorrect; a sex index < 0.5 indicates male (not intersex), and 0.5-1.0 indicates intersex. D is correct; the Y chromosome in Drosophila is not testis-determining. Thus, B and C are incorrect.
Step 4: Conclusion
Statements B and C are incorrect.
Final Answer: (C)
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