Evolution practice · Hard

Biomagnification of DDT

Assertion (A): Resistant organisms/cells are appearing in a time scale of months or year and not centuries.

Reason (R): Rate of evolution due to anthropogenic action is more faster than nature.

choose the correct answer from the options given below:

According to Hardy-Weinberg's law, if the frequency of non-tasters of PTC paper in a population, is $16 \%$, then find out the frequency of dominant allele. Also calculate the percentage of heterozygous individuals in the population.

Pasteur and Koch are related to

[A]: The earliest living organisms were structurally simple.

[R]: The earliest living organisms were more complex than present one.

Formation of which complex molecules was noticed by Urey and miller when they subjected substances to electric discharge :

[A]: Homology is the similarity between organs of same animal based on common ancestory.

[R]: Analogy is seen in every organ system from fish to man.

During origin of life and evolution of organisms, aerobes evolved

In a population of 5000 individulas, 800 are aa type. What will be the number of Aa type individulas

Which of the following is not a connotation of theory of special creation?

Read the following statements.
Statement-A : Triceratops was a three horned, quadruped dinosaur.
Statement-B : Brachiosaurus had plates on its back and was a flesh eating biped dinosaur.
Choose the correct option.

Golden ages of reptiles and fishes are respectively

Which one of the following is the correct match:

Gaseous mixture used by Miller for the synthesis of amino acids through heat and electric discharge included

No organic compounds are synthesized in direction of origin of life now-a-days due to :

Read the following statements.
I) Directional selection occurs when natural selection favours one extreme of continuous variation.
II) Disruptive selection occurs when natural selection favours both extremes of continuous variation.
III) In directional selection, a population's genetic variance shifts toward a new phenotype when exposed to environmental changes.
IV) Random changes in gene frequencies due to chance in large population is called genetic drift.
True statements are

Assertion (A): The primitive atmosphere was reducing atmosphere.

Reason (R): Free oxygen was absent in the primitive atmosphere.

In a population of 100 cats, 36 were white and 64 were black. If the black allele is dominant over white
allele, what is the frequency of black allele in this population of cats?

Which of the following is the first vascular plant to be represented by an extinct group?

[A]: 'Ontogeny recapitulates phylogeny' was the concept put forward by Haeckel.

[R]: The embryonic stages show the course of evolution which an adult has gone through during development.

A biologist is trying to infer how five closely related species of snakes are related to one another. She noticed that some of the snakes have forked tongues and others do not. Which of the following would help her to distinguish their ancestral state?

Read the following statements and find out correct statements:

A) More individuals acquire peripheral character value at both ends of distribution curve - Directional selection.

B) Change in gene frequency occurs by chance - Genetic drift.

C) More individuals acquire mean character value - Stabilizing selection.

D) Sudden disappearance of dinosaurs from the earth - 200 mya.

Which of the following is the relatively most accurate method for dating fossils?

The ratio of methane, ammonia and hydrogen in Stanley Millers experiment was

Assertion : The immediate ancestor of present
day humans was Australopithecus.

Reason : The fossils of Australopithecus were
discovered from Australia, and its cranial
capacity was 1150-1300 $c{m^3}$
which is very close
to that of humans 1400-1450 $c{m^3}$
.

Variation in gene frequencies within population can occur by chance rather than by natural selection. This is referred to as

Darwin finches are related to which of the following evidences :

How do we compute the age of a fossil

In a population of 10,000 individuals, 6,400 individuals are of the genotype ‘AA’, 3,200 individuals are of the
genotype ‘Aa’ and the remaining individuals are of the genotype ‘aa’. Based on this data, the frequency of
the allele ‘A’ in the population is

In equation,${p^2} + 2pq + {q^2} = 1$Where,I. ${p^2}$= Homozygous dominant genotype
II. ${q^2}$= Heterozygous dominant genotype
III. 2pq= Heterozygous genotype
Identify which entity (${p^2},{q^2}$ and 2pq) is not described correctly?