Answered

Environmental factors can influence natural selection because they can increase or decrease:


Athe number of chromosomes in an individual.
Bthe number of chromosomes in a population.
Cthe amount of genetic variation in an individual.
Dthe amount of genetic variation in a population.

Verified Answer :

Final answer:

Environmental factors influence natural selection by affecting genetic variation within a population, rather than changing chromosomes directly. These influences can dictate which traits are favored for survival and reproduction. As a result, the genetic makeup of populations can evolve over time in response to ecological pressures.


Explanation:

Understanding Environmental Factors and Natural Selection

Environmental factors play a crucial role in influencing natural selection by affecting the amount of genetic variation within a population. Instead of altering the number of chromosomes directly, these factors can influence traits that are important for survival and reproduction, which in turn affect how frequently different alleles appear in a population.

Effects of Environmental Factors

These environmental influences include conditions such as climate, availability of resources, and presence of predators. For example:

  • If a drought occurs, only the plants that can survive with less water will thrive, leading to a population that predominantly carries drought-resistant traits.
  • A change in predator population might favor certain traits in prey species, such as speed or camouflage.

As these traits beneficial for survival become more common, the genetic variation of traits in the population shifts, enhancing the species' adaptability to changing environments.


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