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History of genetics
Learn introductory genetics with Braimy- B.Sc agriculture
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A. Asexual reproduction in Neurospora:

a) By culture:

  • Placing a fragment of the threadlike hyphae of a mycelium of the fungus on a suitable culture medium.
  • Each hyphae is segmented and each segment usually contains more than haploid nucleus.

b) By conidia:

  • Conidia helps in formation of new mycelia.

Sexual reproduction in Neurospora:

  • Usually takes place by ascospore.
  • Conidia acts as male gamete and trichogyne acts as female organ.
  • When a conidium from one mating type contacts a receptive trichogyny of the opposite mating type, it moves into the fruiting body, dividing mitotically as it goes alone, and fertilizes a no. of maternal nuclei.
  • Diploid sexual zygotes are thus formed that are each enclosed in an oval ascus sac.
  • The zygote in each ascus immediately divides meiotically to yield 4 haploid cells which then under goes a single mitosis to furnish a total of 8 haploid cells per ascus called ascospore.
  • The ascospore is haploid and grows directly into a new mycelium.

Neurospora LIFE CYCLE

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