Page No 143:
Question 1:
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Page No 147:
Question 1:
How do Mendel’s experiments show that traits may be dominant or recessive?
Page No 147:
Question 2:
How do Mendel’s experiments show that traits are inherited independently?
Page No 147:
Question 3:
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits − blood group A or O − is dominant? Why or why not?
Page No 150:
Question 1:
What are the different ways in which individuals with a particular trait may increase in a population?
Page No 150:
Question 2:
Why are traits acquired during the life-time of an individual not inherited?
Page No 150:
Question 3:
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
Page No 151:
Question 2:
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Page No 151:
Question 3:
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Page No 156:
Question 2:
Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?
Page No 156:
Question 3:
What are fossils? What do they tell us about the process of evolution?
Page No 158:
Question 1:
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
Page No 158:
Question 2:
In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a ‘better’ body design? Why or why not?
Page No 159:
Question 4:
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
Page No 159:
Question 5:
How are the areas of study − evolution and classification − interlinked?
Page No 159:
Question 9:
What evidence do we have for the origin of life from inanimate matter?
Page No 159:
Question 10:
Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
Page No 159:
Question 11:
How is the equal genetic contribution of male and female parents ensured in the progeny?
Page No 159:
Question 12:
Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
