A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation
In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.
Mention three important features of fossils which help in the study of evolution.
Do genetic combination of mothers play a significant role in determining the sex of a new born?
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
(a) reptiles have evolved from birds
(b) there is no evolutionary connection between reptiles and birds
(c) feathers are homologous structures in both the organisms
(d) birds have evolved from reptiles
The theory of evolution of species by natural selection was given by
(a) Mendel (b) Darwin
(c) Morgan (d) Lamarck
The number of pair (s) of sex chromosomes in the zygote of humans is
(a) one (b) two
(c) three (d) four
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