In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are
  • (i) and (ii)
  • (iii) only
  • (iii) and (iv)
  • (ii) and (iv)
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant (rr YY), the seeds produced in F1 generation are
  • round and yellow
  • round and green
  • wrinkled and green
  • wrinkled and yellow
Human teeth and elephant’s tusk are
  • Analogous organs
  • Vestigeal organs
  • Homologous organs
  • Rudimentary organs
Independent inheritance of two separate traits, shape and colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio of:
  • 3 : 1
  • 9 : 3 : 3 : 1
  • 1 : 1
  • 9 : 4 : 2 : 1
Which of these is not a vestigial organ in human beings?
  • Appendix
  • Wisdom tooth
  • Nictitating membrane
  • Gall bladder
Evolution of wild cabbage is an example of:
  • Artificial selection
  • Natural selection
  • Mutation
  • Genetic drift
The modern day Human species has evolved from its earliest ancestors who lived in:
  • Asia
  • Australia
  • Africa
  • China
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
  • double fertilisation
  • self pollination
  • cross fertilisation
  • no fertilisation
A zygote which has an X-chromosome inherited from the father will develop into a
  • boy
  • girl
  • X- chromosome does not determine the sex of a child
  • either boy or girl
New species may be formed if
  • (i) and (ii)
  • (i) and (iii)
  • (ii), (iii) and (iv)
  • (i), (ii) and (iii)
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F
  • (i) and (ii)
  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (iii)
A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?
  • Carrot and potato
  • Carrot and tomato
  • Radish and carrot
  • Radish and potato
If the fossil of an organism is found in the deeper layers of Earth, then we can predict that
  • the extinction of organism has occurred recently
  • the extinction of organism has occurred thousands of years ago
  • the fossil position in the layers of Earth is not related to its time of extinction
  • time of extinction cannot be determined
A trait in an organism is influenced by
  • paternal DNA only
  • maternal DNA only
  • both maternal and paternal DNA
  • neither by paternal nor by maternal DNA
Select the group which shares maximum number of common characters.
  • two individuals of a species
  • two species of a genus
  • two genera of a family
  • two genera of two families
According to the evolutionary theory, formation of a new species is generally due to
  • sudden creation by nature
  • accumulation of variations over several generations
  • clones formed during asexual reproduction
  • movement of individuals from one habitat to another
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F
  • 1 : 3
  • 3 : 1
  • 1 : 1
  • 2 : 1
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
  • reptiles have evolved from birds
  • there is no evolutionary connection between reptiles and birds
  • feathers are homologous structures in both the organisms
  • birds have evolved from reptiles
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is
  • 1 :1
  • 1 :2
  • 3 :1
  • 1 : 3
A gamete contains
  • Two alleles of a gene
  • One alleles of a gene
  • All alleles of a gene
  • None of the above
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