Hello
hhaya0307 , If you want to know about vestigial organs then from some research on internet I found that vestigial organs are those organs which is non functional tissue or organs and for example appendix which is one of the best example.

Hope it will be helpful for you :)

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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.

HOPE THIS WILL HELP YOU

GOOD LUCK