BIOLOGY 1 Marks Question

Darwin's finches of the Galapagos islands had common ancestors but now have different types of modified beaks according to their food habits.

Species can be defined as a group of organisms that can interbreed under natural conditions and produce fertile off springs.

Analogous structures are not anatomically similar/do not have common ancestors and evolving for similar function in the same habitat.

1. First form of life could have come from pre-existing non-living organic molecules/RNA & Protein.
2. Formation of life was preceded by chemical evolution/formation of diverse organic molecules from inorganic constituents.

Homo habilis did not eat meat/vegetarian.
Homo erectus ate meat (meat eater).

16, Mitosis.

Two closely related species competing for same resources, cannot coexist indefinitely (the inferior will be eliminated).

Similar in function/analogous organs, convergent evolution.

Dryopithecus/Ramapithecus.

It indicates gene migration/gene flow/genetic drift/mutation/genetic recombination/natural selection leading to evolution.

Forelimbs of horse/cow/dpg/cat.Wings of bird/bat.
Flippers of dolphins/whale/seal.

Individual with reproductive fitness passes on the useful gene to the next generation.

Individual with reproductive fitness passes on the useful gene to the next generation.

Single step (large) mutation.

Natural selection/survival of fittest/escaped predators due to camouflage.

Similar infunction(fly)/different in structure and origin/analogous organs, convergent evolution.

Louis Pasteur.

Initiator Codon, codes for Methionine.

Convergent evolution.

Mutation (s)/large (heritable) differences arising suddenly in a population/Saltation (single step large mutation).

1. About 15 million, primates called Dryopithecus was more ape-like.
2. About 2 million, Australopithecines lived in East African grasslands.

Spotted cuscus.

Homo habilis.

Coelacanth.

Lemur and Bobcat.

Pelycosaurs and Therapsids.

Ichthyosaurs.

Seed ferns.

Mutation and Natural Selection are the other two factors.

Lamarckism.

Biogenesis states that life originates from pre-existing life.

Charles Darwin.

There will be no organic evolution will occur in such a population.

It is the evolutionary process in which different species starting from a common point in a geographical area radiate to other geographical areas.

Louis Pasteur rejected the theory of spontaneous generation and stated that life originates from pre-existing life.

The change in frequency of alleles indicates evolutionary change.

Origin of life is considered a unique event in history of universe.

Homo habilis.

Development of different functional structures from a common ancestral form is called adaptive radiation.

Fossils are the remains or impressions of ancient organisms preserved in sedimentary rocks or other media.

It demonstrates that pre-existing gene mutation is the basis of adaptation.

The systematic and scientific study of fossils is called paleontology.

It is the evolutionary process by which same structures developed differently due to different needs.

The energy was in the form of electric discharges from electrodes.

When the change in allele frequency is so different that the new sample of population becomes a different species, the original drifted population becomes founders to cause founder effect.

Saltation.

The study of history of life is called evolutionary biology.