Reproduction :-
Reproduction is the process by which living organisms
produce new individuals of the same species.
Reproduction is necessary for the survival and increase
in the population of a species. If organisms do not
reproduce, their population decreases and species will
become extinct.
Significance of Reproduction:
1. It allows continuity of of a species generation after
generation.
2.It plays an important role in evolution by transmitting
favorable variations from one generation to another
generation.
,Body design of organisms: Organisms look similar
because their body design are similar.
• Reproduction at its most basic level involves making copy
of the blue print of body design.
• DNA in the cell nucleus is the information source for
making protein and different proteins lead to different body
design.
• A basic level of reproduction is the creation of a DNA copy.
• DNA copy is accompanied by a cell division giving rise to
two cells.
• DNA copying always involves some variation, hence DNA
copies generated are similar but not identical.
this tendency of variation during reproduction leads to
evolution.
,The importance of variation :-
DNA copying during reproduction is important for
maintaining the body designs of different organisms to
survive in the existing environment. But the environment is
constantly changing due to changes in temperature,
climate, water levels etc. If organisms cannot adjust
themselves to the changes in the environment then their
species will become extinct.
If there are variations in some individuals of a species
they may be able to survive the changes in the
environment.
So variations in species is necessary for the survival of
different species and for the evolution of new species.
, 4) Types of reproduction :-
There are two main types of reproduction in living organisms. They
are asexual reproduction and sexual reproduction.
Asexual reproduction :- is reproduction in which new individuals
are produced from a single parent.
Sexual reproduction :- is reproduction in which two individuals
are involved to produce a new individual.
Asexual reproduction is of different types. They are:- fission,
budding, regeneration, fragmentation, spore formation, vegetative
propagation etc.
Reproduction is the process by which living organisms
produce new individuals of the same species.
Reproduction is necessary for the survival and increase
in the population of a species. If organisms do not
reproduce, their population decreases and species will
become extinct.
Significance of Reproduction:
1. It allows continuity of of a species generation after
generation.
2.It plays an important role in evolution by transmitting
favorable variations from one generation to another
generation.
,Body design of organisms: Organisms look similar
because their body design are similar.
• Reproduction at its most basic level involves making copy
of the blue print of body design.
• DNA in the cell nucleus is the information source for
making protein and different proteins lead to different body
design.
• A basic level of reproduction is the creation of a DNA copy.
• DNA copy is accompanied by a cell division giving rise to
two cells.
• DNA copying always involves some variation, hence DNA
copies generated are similar but not identical.
this tendency of variation during reproduction leads to
evolution.
,The importance of variation :-
DNA copying during reproduction is important for
maintaining the body designs of different organisms to
survive in the existing environment. But the environment is
constantly changing due to changes in temperature,
climate, water levels etc. If organisms cannot adjust
themselves to the changes in the environment then their
species will become extinct.
If there are variations in some individuals of a species
they may be able to survive the changes in the
environment.
So variations in species is necessary for the survival of
different species and for the evolution of new species.
, 4) Types of reproduction :-
There are two main types of reproduction in living organisms. They
are asexual reproduction and sexual reproduction.
Asexual reproduction :- is reproduction in which new individuals
are produced from a single parent.
Sexual reproduction :- is reproduction in which two individuals
are involved to produce a new individual.
Asexual reproduction is of different types. They are:- fission,
budding, regeneration, fragmentation, spore formation, vegetative
propagation etc.
