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  • Following a severe drought that nearly decimated a small population of flies, an even distribution of black-bodied and tan-bodied flies experienced a significant change in the next generation, with

Following a severe drought that nearly decimated a small population of flies, an even distribution of black-bodied and tan-bodied flies experienced a significant change in the next generation, with twice as many black-bodied flies compared to tan-bodied flies. What is the most probable mechanism that influenced this shift within the population?


 

Option: 1

The Bottleneck effect


Option: 2

Genetic drift


Option: 3

Selective breeding

 


Option: 4

The Founder effect


Answers (1)

best_answer

The bottleneck effect is the most probable mechanism that caused the shift in the fly population. The severe drought drastically reduced the population size, allowing only a small group of flies to survive and reproduce. This led to a decrease in genetic diversity. if black-bodied flies were more prevalent among the survivors, their increased numbers in the next generation would explain the shift, with twice as many black-bodied flies compared to tan-bodied flies. The bottleneck effect, resulting from the population reduction, is responsible for this observed change in the fly population.

Hence, the correct answer is option 1.

Posted by

Irshad Anwar

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