Question:
According to the most common evolutionary stable strategy (ESS), the ratio of males to females in a population is ____.
According to the most common evolutionary stable strategy (ESS), the ratio of males to females in a population is ____.
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If one sex becomes rare, parents producing that sex leave more grandchildren. Think of what ratio is stable.
Updated On: Nov 12, 2026
- 1000 : 1000
- 1001 : 999
- 999 : 1001
- 989 : 1011
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
An evolutionarily stable strategy (ESS) is a strategy that, once common, cannot be bettered by another strategy.
Step 2: Apply to sex ratio
If one sex becomes rarer, parents who produce that sex have more grandchildren, so its numbers rise again.
Step 3: Stable point
The only stable point is equal production of both sexes, a 1 : 1 ratio. So the ratio is 1000 : 1000.
Final Answer:
The ESS sex ratio of males to females is 1000 : 1000. \[ \boxed{\text{(A) }\text{1000 : 1000}} \]
An evolutionarily stable strategy (ESS) is a strategy that, once common, cannot be bettered by another strategy.
Step 2: Apply to sex ratio
If one sex becomes rarer, parents who produce that sex have more grandchildren, so its numbers rise again.
Step 3: Stable point
The only stable point is equal production of both sexes, a 1 : 1 ratio. So the ratio is 1000 : 1000.
Final Answer:
The ESS sex ratio of males to females is 1000 : 1000. \[ \boxed{\text{(A) }\text{1000 : 1000}} \]
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