GENETICS AND EVOLUTION
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
absence of a predator species
|
|
|
large habitat areas for the species
|
|
|
genetic variability within the species
|
|
|
adequate sources of water for the species
|
Detailed explanation-1: -So, the correct answer is ‘Stabilising natural selection’.
Detailed explanation-2: -Mutations and gene flow increase the genetic variation within populations (intrapopulation diversity), while natural selection and genetic drift reduce it (Eriksson and Ekberg 2001). In addition to these four factors, inbreeding also reduces genetic variation within the population.
Detailed explanation-3: -Loss of genetic diversity increases the risk of extinction of a population through inbreeding depression. In addition, the number of deleterious genetic variations, which might accumulate in a small population through genetic drift, can also make the population vulnerable.
Detailed explanation-4: -An adaptation is any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.