Sporogenesis

HOW SPORES FORM IN LIVING ORGANISMS

1. Types of Asexual Reproduction

2. Binary Fission A fully grown unicellular organism divides into two daughter cells. The daughter cells are genetically identical to the parent. Steps in Binary Fission Step 1 : DNA is copied inside the parent organism. Step 2 : Organism grows in size and distance increases between two genetic materials . Step 3 : The cell wall starts growing and the genetic materials drift further apart. Step 4 : Cell divides completely giving rise to two daughter cells.

3. one-celled, reproductive unit capable of giving rise to a new individual without sexual fusion, characteristic of lower plants, fungi, and protozoans . sometimes dormant spores are formed due to unfavourable condition. spores may form as a result of meiosis (in Plants), or mitosis (some Fungi and algae) Two types of spores Reproductive spores Dormant Spores Sporogenesis

4. Reproductive Spores produced by one parent only (through mitosis). are genetically identical to that parent. Parts involving Sporogenesis : thallus is the plant body. Sporangium: special reproductive sac .

5. Dormant Spores To survive unfavourable condition Metabolically Dormant Offer resistance to: Freezing Heating Dessication Pressure Radiation Chemicals Seen in s ome algae, fungi and bacteria Chlamydospores , teliospores , zygospores , and myxospores are types of dormant spores.

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