Evolution practice · Mixed difficulty

If a population in Hardy-Weinberg equilibrium has $16 \%$ homozygous individuals with a recessive allele ' $a$ ' then the frequencies for given genotypes would be

Hardy –Weinberg principle explains

The first formed organism (riboorganism) used only _____ for catalysing reactions.

Select the examples which favours the mutational theory of evolution
I. Ancon sheep II. Hornless cattle
III. Cicer gigas IV. Novel oranges
V. Hairless cat VI. Double toed cat
The correct combination is

The finch species of the Galapagos Islands are grouped according to their food sources. Which of the following is not a finch food source?

Which of the following is an example for link – species?

Which of the following statements are correct? I. Directional selection favours one extreme form over the other extreme and over intermediate forms of a trait,  II. Stabilising selection favours the intermediate forms of a trait, III. Disruptive selection favours both the extreme forms of a trait,  IV. Fossils are the remnants of hard parts of life forms present in rocks,  V. A study of fossils in different sedimentary layers indicates the geological period in which they live, VI. Radio isotopes are often used to determine the age of the fossils,  VII. Study of fossils is called Palaeontology,  VIII. Most fossils are found in sedimentary rocks,  IX. The unit of evolution is population.

A change in the relative abundance of an allele (the allelic frquency) within a population, over a succession of generations is called

Assertion : The earliest fossil form in the
phylogeny of horse is eohippus.

Reason : Eohippus lived during the early
pliocene epoch.

Hardy-Weinberg principle is the

‘Use and disuse’ theory was proposed by

Hardy-Weinberg described the frequency of …A… for an entire …B… .
Choose the correct option for A and B to complete the given NCERT statement

The different varieties of pigeon like Pouter, Jacobin,
Fantail are the examples of

Proteins found in the blood of man and ape are similar. This is an example of

Which one of the following is the most primitive ancestor of man?

Darwin judged the fitness of an individual by

In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is

Diversity of living organisms is due to

What happened to $\mathrm{N}{\mathrm{H}_3}$ present in the primary atmosphere during its conversion to the secondary atmosphere?

Assertion: Those who are better fit in environment, leave more progeny than other.

Reason: More reproducing organism will servive more and hence are selected by nature.

In the light of the above statements, choose the correct answer from the options given below :

Which of the following statement is correct?

Divergent evolution gives rise to

Why the genetic variation is important from an evolutionary standpoint

The classical example of adaptive radiation in development of new species is

Fossil X is older than fossil Y if

Assertion: Thorns and tendrils of Bougainvillea and cucurbita represent homology.
Reason: Homologous organs have similar functions but are different in their structural details and origin.

[A]: Mimics are always or more often defenceless.

[R]: Mimics are always less in number than the model individuals.

[A]: Man's most characteristic feature in which it differs from all its primate relatives is his large brain and high intelligence.

[R]: A lumbar curve is absent in man which is present in apes.

In which era Protozoa, sponge and algae were originated?

What is common to whale, seal and shark?