Evolution MCQs

Consider the following statements regarding gene migration and gene flow:

I. When a section of a population moves to another place, gene frequencies change only in the new population.
II. New genes or alleles are added to the new population and are lost from the old population.
III. If gene migration happens multiple times, it is termed gene flow.

Which of these statements are correct?

Evaluate the statements below regarding genetic drift and the founder effect:

I. If the change in allele frequency between populations occurs purely by chance, it is called genetic drift.
II. In some instances, the change in allele frequency is so extreme in the new sample that they become a different species.
III. The original drifted population is called the founder population, and this genetic alteration is the founder effect.

Which of the following combinations represents correct statements?

Review these statements concerning mutations and speciation in populations:

I. Advantageous mutations must pre-exist in a population to be selected by nature and result in new phenotypes.
II. According to Hugo de Vries, mutations are small, directional variations that gradually alter genetic equilibrium.
III. Recombination during gametogenesis is a major source of genetic variation affecting future generations.

Which option lists only the correct statements?

In a study of natural selection on quantitative traits, three patterns of selection are observed. Analyze these statements:

I. Stabilising selection occurs when individuals at both extreme ends of the trait distribution are favored.
II. Directional selection shifts the curve in one direction, favoring individuals with values other than the mean value.
III. Disruptive selection splits the population into two distinct phenotypes by selecting for peripheral characters at both ends.

Which of the statements are correct?

Concerning the origin of early cellular life and metabolic milestones:

I. The first cellular forms of life appeared around 2000 million years ago (mya).
II. These early cells were highly complex eukaryotes with well-defined nuclear envelopes.
III. Some of these early cells developed the metabolic capability to split water using light energy, releasing oxygen.

Select the correct statement(s):

Read the statements below regarding early life in water and land invasion:

I. By 500 mya, invertebrates were formed and highly active.
II. Sea weeds and a few plants existed probably around 320 mya.
III. Animals were widespread on land when the first plants invaded land.

Which of these statements are correct?

Consider the following statements regarding the evolutionary history of fish:

I. Jawless fish probably evolved around 350 mya.
II. Fish with stout and strong fins that could crawl onto land and return to water evolved around 350 mya.
III. A Coelacanth caught in South Africa in 1938 was identified as a living lobefin.

Which of the combinations contains only correct statements?

Analyze these statements concerning the origin of amphibians and reptiles:

I. Lobefins were the direct ancestors of modern amphibians like frogs and salamanders.
II. Amphibians evolved into reptiles.
III. Reptiles lay thin-shelled eggs in water to protect them from desiccation.

Which of the statements are correct?

Evaluate the statements below regarding prehistoric flora and fossil fuels:

I. Giant ferns (pteridophytes) were widespread during early terrestrial history.
II. These giant ferns slowly fell and decomposed under pressure to form coal deposits.
III. Pteridophytes evolved directly from advanced angiosperms.

Select the correct statements:

Consider these statements about aquatic and terrestrial reptiles of the Mesozoic era:

I. Some land reptiles returned to water to evolve into fish-like reptiles around 200 mya, such as the Ichthyosaurs.
II. Dinosaurs dominated the terrestrial habitat for millions of years.
III. All land reptiles of the Mesozoic era returned to water and became extinct.

Which statement(s) is/are correct?