Natural Selection - Natural selection occurs only if there is both (1) variation in the genetic information between organisms in a population and (2) variation in the expression of that genetic information—that is, trait variation—that leads to differences in performance among individuals.

"The ‘fitness’ of a population helps in evolution." The statement was given by:

Which bacteria first produced O₂?

Which of the following played direct role in organic evolution, according to Modern Synthetic theory?

I. Genetic drift

II. Natural selection

III. Mutation

IV. Variation

Give some examples of natural selection.

Passiflora plant produces toxic glucosides that protect its leaves from several insects. However, Heliconius caterpillars sequester these compounds for their own benefit. Thereby, it gains access to food that few insects can eat. Moreover, Passiflora leaves produce yellow spots that resemble Heliconius eggs. Heliconius butterflies avoid laying eggs on those leaves that already have eggs or yellow spots ensuring hatching of fewer caterpillars per leaf. Thus, Passiflora with these yellow spots are less likely to be eaten. In addition, Passiflora secretes abundant nectar that attracts ants responsible for caterpillar mortality. Given these interactions, the correct option is

What are the types of natural selection

An epidemic of milk-borne gastroenteritis caused by Salmonella was reported in an Indian city in $1985$. Faecal samples from suspected individuals were inoculated into Selenite broth (high Selenium concentration) and incubated. After a thorough investigation, it was found that only Salmonella, and not the common gut bacterium Escherichia coli could grow in this medium. The basis of growth of Salmonella in Selenite broth is

Phylogenetic relationship among plants $\left(P,Q,R,S\right)$ based on their shared characters is shown in the cladogram below.
Identify the plants $P,Q,R$and $S$ in the correct order.

What is natural selection? List the types of natural selection.

Write a note on Organic evolution.

Differentiate between Lamarckism and Neo Lamarckism.

Give reasons why all the acquired characters are not inherited to the next generation?

Write a short note on Neo-Darwinism.

New organs are not formed in organisms by their requirement, is a drawback of Lemarck's theory.

What are the limitations found in Lamarckism?

What are the drawbacks of Lamarck's theory of evolution?

Write a note on the origin of the species.

According to Neo-Lamarckism, only those variations are passed on to the next generation that influences only on somatic cells.

Neo-Lamarckism give importance to internal vital force, appetency and use and disuse of organs. 

Write a note on Neo-Lamarckism.