which environmental factor could lead to a decrease in genetic variation in a population of tuna?\no an…

which environmental factor could lead to a decrease in genetic variation in a population of tuna?\no an increase in food availability\no an increase in pollution\no a decrease in tuna fishing\no a decrease in tuna predators

which environmental factor could lead to a decrease in genetic variation in a population of tuna?\no an increase in food availability\no an increase in pollution\no a decrease in tuna fishing\no a decrease in tuna predators

Answer

Answer:

B. an increase in pollution

Explanation:

Step1: Understand genetic variation

Genetic variation is reduced by factors that cause selective pressure.

Step2: Analyze each option

  • An increase in food availability (A) usually promotes growth and may increase genetic variation as more individuals can survive and reproduce.
  • An increase in pollution (B) can act as a strong selective pressure. Pollutants can cause mutations, harm organisms, and lead to the death of less - resistant individuals. This reduces the number of different genotypes in the population, decreasing genetic variation.
  • A decrease in tuna fishing (C) would likely allow the population to grow and could potentially increase genetic variation as more individuals contribute to the gene pool.
  • A decrease in tuna predators (D) would also allow the tuna population to grow and may increase genetic variation as more individuals survive and reproduce.