which environmental factor could lead to a decrease in genetic variation in a population of tuna?\n○ an…

which environmental factor could lead to a decrease in genetic variation in a population of tuna?\n○ an increase in food availability\n○ an increase in pollution\n○ a decrease in tuna fishing\n○ a decrease in tuna predators

which environmental factor could lead to a decrease in genetic variation in a population of tuna?\n○ an increase in food availability\n○ an increase in pollution\n○ a decrease in tuna fishing\n○ a decrease in tuna predators

Answer

Brief Explanations:

  • An increase in food availability: More food means better survival and reproduction chances, which could potentially increase genetic variation as more individuals contribute to the gene pool.
  • An increase in pollution: Pollution can cause harm to tuna. It may lead to a decrease in the number of tuna individuals. When the population size is reduced significantly (a bottleneck effect), genetic variation decreases because only the genes of the remaining individuals are passed on.
  • A decrease in tuna fishing: Fewer tuna being caught would likely mean a more stable or even increasing population. This would not lead to a decrease in genetic variation.
  • A decrease in tuna predators: With fewer predators, tuna survival rates may increase. This would tend to keep or even increase the population size, which is not associated with a decrease in genetic variation.

Answer:

an increase in pollution