Question:
Which of the following is NOT a feature of capacitation process of sperm?
Which of the following is NOT a feature of capacitation process of sperm?
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Capacitation = Preparation stage. Fertilization events (like pronucleus formation) happen later.
Updated On: May 4, 2026
- Acrosomal membrane becomes thin
- Ca$^{++}$ions enter the sperm
- Male pronucleus begins to form
- The tail of sperm shows rapid whiplash movements
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The Correct Option is C
Solution and Explanation
Concept:
Capacitation is a functional maturation process that sperm undergo in the female reproductive tract to gain fertilizing ability.
Step 1: Understand features of capacitation.
• Removal/thinning of acrosomal covering
• Increased permeability to Ca$^{++}$
• Increased motility (hyperactivation)
Step 2: Identify incorrect feature. Formation of male pronucleus occurs after fertilization, not during capacitation.
Step 3: Analyze options.
• (A) Acrosomal thinning → Correct feature \checkmark
• (B) Ca$^{++}$ entry → Correct \checkmark
• (C) Male pronucleus formation → Not part of capacitation $\times$
• (D) Rapid tail movement → Correct \checkmark
Step 4: Conclusion. \[ \text{Incorrect feature = Male pronucleus formation} \]
Capacitation is a functional maturation process that sperm undergo in the female reproductive tract to gain fertilizing ability.
Step 1: Understand features of capacitation.
• Removal/thinning of acrosomal covering
• Increased permeability to Ca$^{++}$
• Increased motility (hyperactivation)
Step 2: Identify incorrect feature. Formation of male pronucleus occurs after fertilization, not during capacitation.
Step 3: Analyze options.
• (A) Acrosomal thinning → Correct feature \checkmark
• (B) Ca$^{++}$ entry → Correct \checkmark
• (C) Male pronucleus formation → Not part of capacitation $\times$
• (D) Rapid tail movement → Correct \checkmark
Step 4: Conclusion. \[ \text{Incorrect feature = Male pronucleus formation} \]
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