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