- Webbed toes of aquatic birds support
(a) Neo-Lamarckism (b) Lamarckism
(c) Darwinism (d) Neo-Darwinism. - Identify the correct sequences in due course of organic
evolution as proposed by Darwin and Wallace.
(a) Overproduction, constancy of population size,
struggle for existence, natural selection
(b) Variations, survival of the fittest, constancy of
population, overproduction, natural selection
(c) Variations, natural selection, survival of the fittest,
struggle for existence, overproduction
(d) Overproduction, variations, constancy of population
size, struggle for existence, natural selection - Sympatric populations can be best identified as
(a) two populations that are physically isolated by
natural barriers
(b) two populations that remain isolated but occasionally
come together to interbreed
(c) two populations that live together and freely
interbreed to produce sterile offspring
(d) two populations that share the same environment
but cannot interbreed. - According to Darwin, the ‘survival of the fittest’ indicates that
(a) the strongest of all species survives
(b) most intelligent of the species survives
(c) the cleverest of species survives
(d) the most adaptable of species survives.
5. Variations in gene frequencies within populations can occur
by chance rather than by natural selection. This phenomenon
is referred to as
(a) genetic drift
(b) random mating
(c) genetic flow
(d) genetic load.
6. Hugo de Vries’ theory of mutation is
(a) opposed to natural selection theory
(b) not opposed to natural selection theory
(c) opposed to germplasm theory
(d) not opposed to Lamarck’s theory.
7. During industrial revolution in England, the black coloured
peppered moth forms became dominant over the light
coloured forms. This is due to
(a) protective mimicry
(b) inheritance of dark colour acquired due to darker
environment
(c) natural selection wherein dark forms are selected
(d) poor sunlight which favours dark coloured forms.
8. Which of the following evidences does not support the theory
of natural selection?
(a) Mimicry and protective colouration
(b) Production of new varieties of plants and animals
(c) Presence of vestigial organs
(d) Correlation between nectaries of flowers and
proboscis of insects
HOMOLOGY IN CHROMOSOMES OF MAN AND GREAT APES
- Each human somatic cells contains 46 chromosome (44 autosomes + 2 sex chromosomes) while each somatic cell of gorilla,
chimpanzee, etc., has 48 chromosomes. The chromosomes obtained from a cell such as WBCs are treated with specific stains
to produce banding patterns characteristic to specific chromosomes. - The banding pattern suggests the structure of chromosomes and the comparison of banding patterns of individual chromosome
of humans and ape. - The banding patterns of human chromosome number 3 and 6 shows a common origin for man and chimpanzee.
Chromosomal similarities
Show similar banding patterns for
chromosome number 3 and 6 in both
humans and apes.Blood proteins
The proteins present in blood
of humans are similar to those
present in chimpanzee and gorilla.Blood groups
Presence of blood groups A and B
in apes (not in monkeys) indicate
a closer relationship with man.Haemolgobin
There is 99% homology in
haemoglobin of man and gorilla,
suggesting their common origin.Evidences showing common origin of man and ape