Microbiology Workshop

MICROBIAL REPRODUCTION

  • When conditions ideal micro-organisms have the potential to multiply rapidly.
  • If food available, micro-organisms can rapidly colonize and utilize it.
EUKARYOTIC REPRODUCTION

ASEXUAL REPRODUCTION (Asexual reproduction)

  • offspring are identical to the single parent
  • enables quick use of a substrate

    ASEXUAL REPRODUCTION IN FUNGI
      - each fungal cell has potential to separate from hypha and produce a new colony
      - spores and conidia - specialised cells produced for dispersal

SEXUAL REPRODUCTION (Sexual Reproduction)

  • offspring have genetic components from two parents
  • provides genetic variety to enable colonisation of slightly different substrates

    SEXUAL REPRODUCTION IN FUNGI, ALGAE AND PROTISTS
      - various mechanisms used to unite the DNA from two different parents to produce new offspring

PROKARYOTIC REPRODUCTION

Introduction of genetic variation

  • mutation- immediately expressed since bacteria haploid
  • integration of new genetic material
  • transformation of free genetic material
  • conjugation - transfer of DNA by plasmid
  • transduction - transfer of DNA by bacteriophage
  • rapid rate of replication; new genes and gene combinations appear and spread quickly.

Reproduction without genetic variation - Fission

  • very rapid
  • progeny have chromosome identical to original parent