Theory of Natural selection dwells on[1993]a)role of environment in evolutionb)natural selection acting on favourable variationsc)changes in gene complex resulting in heritable variationsd)none of theseCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

According to Darwin's theory of natural selection, in the struggle for existence, only those individuals survive which posses the most useful variations.

Useful variations present in the surviving individuals are passed on to the next generation. Next generation repeats the process of development of variations and natural selection.

answer = C

Answer

Correct answer has to be option'B'
according to Darwins theory of natural selection when organisms struggles for their survival only those are able to live which possess the most useful variations....

Answer

Answer

The correct answer is option 'C': changes in gene complex resulting in heritable variations.

In order to understand why option 'C' is the correct answer, let's first briefly discuss the theory of natural selection. The theory of natural selection was proposed by Charles Darwin and Alfred Russel Wallace in the mid-19th century. It is a fundamental concept in evolutionary biology that explains how species evolve and adapt to their environments over time.

The theory of natural selection is based on several key principles:

1. Overproduction: All species have the potential to produce more offspring than can survive. This leads to competition for limited resources such as food, water, and shelter.

2. Variation: Individuals within a species exhibit variation in their traits, such as size, color, and behavior. This variation is due to differences in their genetic makeup.

3. Heredity: Traits are passed down from parents to offspring through the inheritance of genes. This means that offspring tend to resemble their parents in certain traits.

4. Differential survival and reproduction: Some individuals with certain traits are better suited to survive and reproduce in their environment than others. These individuals have a higher chance of passing on their genes to the next generation.

Based on these principles, natural selection occurs when individuals with certain traits have a higher chance of surviving and reproducing compared to individuals with other traits. Over time, the traits that confer a survival and reproductive advantage become more common in the population, while less advantageous traits decrease in frequency or disappear altogether.

Now, let's relate these principles to the given options:

a) Role of environment in evolution: While the environment plays a crucial role in natural selection by selecting for certain traits, it is not the focus of the theory itself. Option 'A' is not the correct answer.

b) Natural selection acting on favorable variations: This option is partially correct because natural selection does act on favorable variations. However, it does not encompass the full scope of the theory. Option 'B' is not the correct answer.

c) Changes in gene complex resulting in heritable variations: This option is the correct answer because it encompasses the fundamental concept of natural selection. Changes in the gene complex, such as mutations, recombination, and gene flow, lead to variation in traits that can be passed on to future generations through heredity.

d) None of these: This option is incorrect because option 'C' is the correct answer.

In summary, the theory of natural selection focuses on changes in the gene complex resulting in heritable variations. It is these variations that are subject to differential survival and reproduction, leading to the evolution of species over time.

Answer

Answer should be B

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