ASEXUAL REPRODUCTION

ASEXUAL REPRODUCTION

What is Asexual reproduction? Asexual reproduction is the formation of offspring from a single parent.

The offspring are identical to the parent.

 

Types of asexual reproduction.

  • Binary fission in amoeba.
  • Spore formation in Rhizopus.
  • Budding in yeast.

 

Binary fission

  • This involves the division of the parent organism into two daughter cells.
  • The nucleus first divides into two and then the cytoplasm separates into two portions
  • Binary fission also occurs in bacteria, Paramecium, Trypanosoma and Euglena.

 

Spore formation in Rhizopus

  • Rhizopus is a saprophytic fungus which grows on various substrate such as bread, rotting fruits or other decaying organic matter.
  • The vegetative body is called mycelium which has many branched threads called hyphae.
  • Horizontal hyphae are called stolons.
  • Vertical hyphae are called sporangiophore.
  • The tips of sporangiophore become swollen to form sporangia, the spore bearing structure.
  • Each sporangium contains many spores.
  • As it matures and ripens, it turns black in colour.
  • When fully mature the sporangium wall burst and release spores which are dispersed by wind or insects.
  • When spores land on moist substratum, they germinate and grow into a new Rhizopus and start another generation.

 

Spore formation in ferns

  • The fern plant is called a sporophyte.
  • On the lower side of the mature leaves are sari (Singular: sorus) which bear spores.

 

Budding in Yeast

  • Budding involves the formation of a protrusion called a bud from the body of the organism.
  • The bud separates from the parent cell, in yeast budding goes on so fast and the first bud starts to form another bud before the separation.
  • A short chain or mass of cells is formed.

 

See also

REPRODUCTION IN PLANTS AND ANIMALS

BIOLOGY PRACTICAL ACTIVITIES

HUMAN DISEASES (PARASITIC DISEASES)

HUMAN DISEASES – BACTERIAL DISEASES

POLLUTION

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