Question

Green beetles living in green bushes are not eaten by crows.

Answer 1

Evolution refers to gradual change from one form to a different. The concept of evolution was given by Charles Robert Darwin. Selection is the phenomenon wherein, within the wild, select traits favorable to the species in its environment.

Complete step by step answer: Natural selection is that the process whereby organisms better adapted to their environment tend to survive and produce more offspring, whereas other less favorable traits tend to become eliminated. The elimination of genes of certain traits occurs which alters the frequency of the remaining population is understood as genetic drift.

Example - A population of red beetles sleeps in a region. Suppose a color variation arises during reproduction, giving rise to 1 green colored beetle rather than red. This beetle passes the color on to its progeny, in order that all its progeny beetles are green. Crows cannot see green-colored beetles on the green leaves of the bushes, and thus cannot eat them. Therefore the progeny of green beetles isn't eaten, while the progeny of red beetles continues to be eaten. This offers rise to more green beetles than red ones within the beetle population. Here the green-colored variation became common because it gave a survival advantage. In other words, it absolutely was naturally selected by the crows. An increase in the number of crows ends up in more red beetles being eaten and a subsequent increase in the proportion of green beetles within the population. Thus, the action is directing evolution within the beetle population. It ends up in adaptations within the beetle population to suit their environment better.

If another color variation arises during reproduction during this beetle population, which is blue in color rather than red. The progeny beetles of this beetle are blue. Crows can see blue-colored beetles within the green leaves of the bushes furthermore because the red one, and thus can eat them. Initially within the population, because it expands, there are some blue beetles, but most are red. But at now, an elephant comes by, and stamps on the bushes where the beetles live, thereby killing most of the beetles. By chance, the few beetles that have survived are mostly blue. The beetle population slowly expands again, but now, the beetles within the population are mostly blue. So here the color change gave no survival advantage. Instead, it absolutely was simply a matter of accidental survival of beetles of 1 color that changed the common characteristic of the resultant population. The elephant wouldn't have caused such a major change within the beetle population if the beetle population had been very large. So, accidents in small populations can change the frequency of some genes during a population, whether or not they provide no survival advantage. This is often the concept of genetic drift, which provides diversity with no adaptations.

Green beetles got the survival advantage or they were naturally selected as they weren't visible in green bushes. This selection is exerted by crows leading to adaptations within the beetles to suit better in their environment. The rise within the beetles in green bushes increases due to the phenomenon of genetic drift. To maintain a balance in population some variation becomes more susceptible to danger while others gain an advantage of survival.

Note: There are two styles of traits in organisms:
1.Inherited traits: These are the one which is controlled by specific genes and passed from one generation to a different one.
2.Acquired traits: Traits acquired by organisms in their lifetime. This involves the changes within the non-reproductive tissues caused by environmental factors.