Question:
In a population, the most common evolutionary stable strategy for a sex ratio is when _________.
In a population, the most common evolutionary stable strategy for a sex ratio is when _________.
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A 1:1 ratio is stable because the rarer sex is always favoured.
Updated On: Nov 12, 2026
- Number of males exceeds the number of females.
- Number of females exceeds the number of males.
- males and females are in a ratio of 1:1
- females are economically independent from males.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
An evolutionarily stable strategy cannot be replaced by any other strategy once it is common.
Step 2: Sex ratio logic
If one sex becomes rarer, each member of that sex leaves more offspring, so parents producing it are favoured.
Selection pushes the population back until both sexes are equal.
Step 3: Conclusion
The stable sex ratio is 1:1.
Final Answer:
The stable sex ratio is males and females in the ratio 1:1. \[ \boxed{\text{(C) }\text{males and females are in a ratio of 1:1}} \]
An evolutionarily stable strategy cannot be replaced by any other strategy once it is common.
Step 2: Sex ratio logic
If one sex becomes rarer, each member of that sex leaves more offspring, so parents producing it are favoured.
Selection pushes the population back until both sexes are equal.
Step 3: Conclusion
The stable sex ratio is 1:1.
Final Answer:
The stable sex ratio is males and females in the ratio 1:1. \[ \boxed{\text{(C) }\text{males and females are in a ratio of 1:1}} \]
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