Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Types of Reproduction - Sexual Reproduction

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Topics

description

  • Definition and meaning of sexual reproduction
  • Basic characteristics of asexual reproduction
  • Examples of asexual reproduction

notes

Definition and meaning of sexual reproduction:

  • Sexual reproduction involves the formation of the male and female gametes, either by the same individual or by different individuals of the opposite sex.
  • These gametes fuse to form the zygote which develops to form the new organism.
  • It is an elaborate, complex and slow process as compared to asexual reproduction.
  • Because of the fusion of male and female gametes, sexual reproduction results in offspring that are not identical to the parents or amongst themselves.
  • Even with different external morphology, anatomy, and physiology, sexual reproduction in the patterns of plants, animals, and fungi is similar.
  • All organisms have to reach a certain stage of growth and maturity in their life before they can reproduce sexually.
  • Sexual reproduction can be grouped into three distinct stages pre-fertilization, fertilization and post-fertilization events.

notes

Characteristics of Sexual Reproduction: 

  • The involvement of two parents results in the intermingling of genes resulting in the production of a new offspring. 
  • Gamete formation and fertilization take place.
  • The whole process is slow and lengthy.
  • Genetically identical offspring are produced.
  • Offspring are different from parents, genetically and physically.
  • Variations in species increase the chances of survival hence the evolutionary advancements. 

notes

Examples of Sexual Reproduction: 

  • Humans  
  • Mammals 
  • Fungi 
  • Plants, etc.
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Stages of sexual reproduction [00:08:59]
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