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Hi

You can get complete notes for evolution for calss 12th biology by visiting our page the link for tge same is given below

https://learn.careers360.com/biology/genetics-and-evolution-chapter/

Notes will help you to understand the concept in easy way , you can use it as a revision tool to revise the chapter just before your examination or tests.

Thank you

hi,

see if you opt for bsc in zoology/botany/microbiology or any other courses related with biology you need to remember the scientific names, let it be animals or virus or bacterias any thing, scientific names is one of the most important things and it includes in most of the topics related with biology. so you need to think deeply whether you should opt for bachelors in biology related field.

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 the population due to natural disasters (bottleneck effect), or when a new population separates from the original population to form a colony (founder effect).

Genetic drift does not take into account whether the allele is beneficial or harmful to the individual carrying it. It is possible that a beneficial allele is lost and a harmful allele persists.

HOPE THIS WILL HELP YOU

GOOD LUCK!

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 a single grain eater species.

Natural Selection

In this process, the variations in an individual facilitate better survival of species. They reproduce in large numbers. These variations are passed on to successive generations which help them to survive in the changing environmental conditions. For eg., few giraffes have long necks while others have short necks. If the low-lying shrubs are eliminated for some reason, the giraffes with short necks would be replaced by giraffes with long necks.

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GOOD LUCK

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 defence mechanism developed in the prey. During this phenomenon, animals change their skin colour or disguise themselves as per their surrounding colour so that they cannot be detected by other predators. Certain predators also use this mechanism for hunting. For instance, Stone Flounder, a flatfish, is one such predator which lays on the ocean floor in search of its prey.

Following are a few examples of camouflage animals:

• Owl
• Uroplatus Geckos
• Toads
• Seahorse
• Frog
• Spider
• Stick insect
• Snow Leopard

Hope this was helpful!