Explain:-
• Lamarckism
• Evolution
• Mutation
Answers
Answer:
Explanation:
1) Lamarckism, which also known as Lamarckian inheritance is a theory of evolution. This theory was proposed by Jean- Baptiste de Monet Lamark in the year 1744-1829.It is based on the principle that physical changes in organisms during their lifetime could be transmitted to their offspring. For eg., the development of an organ when used many times. Another examples include evolution of giraffe, Aquatic Birds with webbed toes, Extinction of Limbs in Snakes, Flightless Birds, Cave dwellers etc.
2) Evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. In other words we can say that evolution is the process by which modern organisms have descended from their ancestors with changes in their allele frequencies. The mechanism of evolution mainly occurs due to changes in the gene pool. There are many theories that explain how life originated in the planet earth, out of which Darwin's theory of evolution is most popular.
3)Mutation-It is the changes in the DNA sequence of a living organism due to various environmental factors. DNA sequence which is specific to each organism can sometimes undergo changes in its base pairs sequence. A mutation can lead to changes in proteins translated by the DNA. The three types of mutation are silent mutation, nonsense mutation and missense mutation.