Reproduction in Organisms
Sexual Reproduction- pre-fertilisation, fertilisation, post fertilisation
Sexual reproduction :
- It is also referred as Amphimixis, Syngenesis (or) Amphigony
→ No rapid multiplication
→ Mitosis/ Meiosis
→ Daughter organisms graphically differ from parents
- On the basis of fusing gametes source syngamy is of 2 types (i) Endogamy (self Fertilization) Eg. Taenia and (ii) exogamy (cross fertilization)
- On the basis of structure of fusing gametes syngamy is of 4 types
- There events in sexual reproduction is pre fertilization, fertilization and post fertilization.
- Gametogenesis and Gameti transfer are the two steps in pre-fertilization
- Types of meiosis
⇒ Zygotic meiosis Eg. Chlamydomonas
⇒ Sporic meiosis Eg- Plants
⇒ Gametic meiosis Eg. Animals
- Two types of Fertilization are (i) External (Eg. Bony fishes /Amphibians) most algae - (ii) Internal fertilization - Reptile, Birds, mammals
- Post fertilization involves Zygote development and Embryogenesis.
- Development of an egg into a complete individual without fertilization.
⇒ Rapid mode of division
⇒ Simple and easier means of reproduction
⇒ Sex determination in honey bees
- No role in Evolution as is provides no variation.
- Egg has all the factors, essential for development, but only it needs stimulus for the development
Part-1: Watch this video for the topic from 36:49 to 51:16
Part-2: Watch this video for the topic from 0:40 to 51:50
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