examining an example of genetic variations of a population over time

Answer 1

One example of genetic variations of a population over time can be seen in the case of the peppered moth (Biston betularia) in England. Prior to the Industrial Revolution, the peppered moth had a light coloration, which helped it blend in with the light-colored tree bark on which it rested during the day. This provided the moth with some level of camouflage and protection from predators.

However, with the industrialization of England in the 19th century, the widespread pollution resulted in the darkening of tree bark due to soot deposits, making the light-colored moths more visible to predators. As a result, a genetic variation in the population known as the melanic form, with dark coloration, began to increase in frequency.

Over time, the dark-colored melanic form became dominant in industrial areas as it provided better camouflage against the darkened tree bark. Meanwhile, the light-colored form remained prevalent in rural areas where tree bark had not been darkened by pollution. This shift in the frequency of the two different color forms of peppered moths is a classic example of natural selection in action, driven by changes in the environment.

This case study of the peppered moth population in England demonstrates how genetic variations within a population can change over time in response to environmental pressures, leading to adaptation and evolution. It also highlights the important role of genetic variations in enabling species to survive and thrive in changing environments.

Answer 2

Please less words so i can understand

Answer 3

Sure! In England, peppered moths were mostly light-colored before the Industrial Revolution. Pollution darkened tree bark, making light moths easy targets for predators. Dark-colored moths, better camouflaged, survived and reproduced more. Over time, dark moths became more common in polluted areas. This shows how genetic variations in a population can change in response to environmental changes, helping the species adapt and survive.