Genetic drift operates only in
island population
smaller population
larger population
none of these
B.
smaller population
Genetic drift is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. It is more likely to occur in a small population.
Oparin and Haldane proposed
the theory of natural selection
that migration affects genetic equilibrium
that mutations caused speciation
that the first form of life could have come from preexisting non-living organic molecules
that the first form of life could have come from preexisting non-living organic molecules
Choose the wrong statement
Louis Pasteur demonstrated that life comes only from pre-existing life
S.L. Miller observed that electric discharge in a flask containing CH4, H2, NH3 and water vapour at 800°C formed amino acids
Flippers of penguins and dolphins are examples for homology
Homology indicates common ancestry
Homology indicates common ancestry
Choose the wrong pair
Divergent evolution – Forelimbs of whales, bats, cheetah and human
Convergent evolution – Flippers of penguins and dolphins
Homologous structures – Vertebrate hearts
Analogous structures – Tendrils of Bougainvillea and Cucurbita
Analogous structures – Tendrils of Bougainvillea and Cucurbita
The eggs of eutherian mammals are
mesolecithal type
microlecithal type
telolecithal type
megalecithal type
The first human-like hominid was called
Homo habilis
Homo erectus
Homo sapiens
Dryopithecus
Dryopithecus
Which of these are examples of evolution by anthropogenic action?
(i) Adaptive radiation of marsupials of Australia.
(ii) Appearance of antibiotic resistant microbes.
(iii) Evolution in finches Galapagos island.
(iv) Appearance of dark winged moth in England during post industrialization period.
(v) Convergent evolution of placental mammals in Australia.
(i) and (iii) only
(v) only
(ii) only
(ii) and (iv) only
(ii) and (iv) only
The hominid fossils discovered in Java in 1891 revealed a stage in the human evolution, which was called
Homo erectus
Dryopithecus
Australopithecus
Homo habilis
Homo habilis
