NCERT Solution for Class 10 Science Chapter 9
Heredity and Evolution
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-150
Questions No-3
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
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Small numbers of tigers means that fewer variations in terms of genes are available. This
means that when these tigers reproduce, there are less chances of producing progeny with
some useful variations. Hence, it is a cause of worry from the point of view of genetics.
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The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adopted to the existing environment and may extinct soon.
The small numbers of surviving tigers are a cause of worry from the point of view of genetics because in tigers there are negligible genetic variations. Due to this they are not well adapted. The rapid environmental changes cannot be favouable for them. If these changes are not controlled, tigers would be wiped out.
Small numbers of surviving tigers means that a small gene pool of tigers is left. A smaller population reduces the chances of variations. A time may come when lack of useful variations may result in extinction of tigers. Hence, a small number of surviving tigers is a cause of worry from the point of view of genetics.
It will affect the frequency of selection which is essential for survival. For effective selection, the population must consist of an infinitely large number of individuals in the population.