Hello james,

Genetic drift is a mechanism of evolution in which the allele frequencies change over generations as a matter of chance.

It occurs in populations of all sizes but its effect is the maximum in a small population.

Genetic drift is observed when there is a sudden decline in

Hello james,

The two key concepts of Darwin’s theory of evolution are:

1. Branching Descent

2. Natural Selection

Branching Descent

It is the process in which new species originate from a single ancestor. They became adapted to the new environment through reproductive isolation. For eg., Darwin’s finches which evolved from

Hello Rajeev!

Camouflage refers to the term disguise. It is a natural phenomenon used by plants and animals to disguise themselves as per their environment. They mimic according to their surroundings to avoid detection. Thus it increases the chance of survival by hiding it from predators.

Camouflage is the natural

Hello,

To get an admission in PHD you need to score 630 marks in GATE score and you need to have 60% of marks in your Degree.

Hope this helps you.

Option number 3 that is Tuatara -> Lizard -> Snake -> Crocodile is the correct answer. Tuataras are reptiles endemic to New Zealand and Lizards were evolved from Tuatara only. The snakes are close relatives of the lizards. However, they lack external ear openings and movable eyelids.

Thank you.

Hi Ishika

Answer is 1. Erectus ->Homo -> Primate ->chordate - >Animalia

Hope it helps you

Best of Luck!

Statement number 2 is the correct one. That is cryptic camouflage is seen in Biston Betularia.

It is a temperate species of moths who fly at night. Biston Betularia is also called as the peppered moth. As an example of natural selection, peppered moth's example is oftenly used.

Best wishes.

Homologous and vestigial organs that is option number 1 is the correct answer.

Homologous organs have a common origin and are built on the same basic fundamental principle but they have variant appearance and perform different functions as well. At the same time, Vestigial organs had important functions in the

Hello Isshika,

The plica semilunaris is a fold of the conjunctiva at the inner corner of the human eye.

The similarity to the nictitating membrane, or third eyelid, of other animals led to the conjecture that it might be the vestige of such a structure, which is still a part