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What is Reproduction and why do we need it ?

Basic Definition

Reproduction is defined as the production of new organisms from the existing ones of the same species . Hence the word ‘Re’

 

YOUNG ONES PRODUCED BY DIFFERENT ORGANISMS - Teachoo.jpg

Now,

  • The process of reproduction requires a large amount of energy
  • It is also not important to maintain the life of an individual like other life processes for eg. digestion, respiration etc. 

So why is there a need for an individual to invest its energy in a process that is not required to keep it alive?

Importance of Reproduction

  • All the living organisms grow old and ultimately die . Therefore, new organisms need to be produced to replace the old ones.
  • Hence, we can conclude that reproduction is essential for continuation of life on earth and for survival of species .
  • Reproduction gives rise to more organisms with the same basic character as their parents. 

For example, a human gives rise to a human, a cat produces a cat and so on.

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The Role of Genetic Material in Reproduction

  • DNA is the genetic material of cells. This means that DNA stores all the information required for a cell to grow, perform various functions and respond to its environment.
  • During cell division, this DNA is passed onto the daughter cells from the parent.
  • Therefore, DNA is inherited from one generation to another. Because  of this reason, the offspring produced are similar to the parent.

SIMILAR BODY DESIGN IS BECAUSE OF SIMILAR DNA - Teachoo.jpg

  • If we alter this information then the type of proteins formed will change thereby changing the whole body design.
  • So, DNA replication (i.e. formation of a copy of the DNA) is a very important step in reproduction.

 

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  • This step ensures that the offspring receives the same copy of DNA as that of the parent.
  • The process of DNA replication is accompanied by creation of additional cell apparatus and then the DNA copies separate.

How does DNA replication gives rise to variations:

  • If the daughter cells produced are completely identical to the parent or not depends on how accurately the DNA copy is made .
  • Since no biochemical reaction is completely reliable, some errors are expected to occur in the DNA copying which results in variation
  • Because of these variations, the daughter cells are similar but not completely identical to the parent .
  • If these variations are very drastic, the DNA may not be able to work and the cell dies.
  • These discrepancies form the basis of evolution .

 

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Transcript

YOUNG ONES PRODUCED BY DIFFERENT ORGANISMS AGING IN HUMANS SIMILAR BODY DESIGN IS BECAUSE OF SIMILAR DNA DNA REPLICATION DNA Replication

CA Maninder Singh's photo - Co-founder, Teachoo

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo