TYPES OF PARTHENOGENESIS -

1.      NATURAL PARTHENOGENESIS -

In many animals natural parthenogenesis is common process & is a method of reproduction.

It is of two types -

(i) Arrhenotoky or haploid parthenogenesis -

1. In this parthenogenesis the haploid egg develops parthenogenetically to form haploid parthenote.
2. eg. Honey bees, Ants, Gall fly, Wasp & Arachnida.
3. In honey bees haploid egg parthenogenetically developed to form male & the fertilize diploid egg forms female.

(ii) Thelytoky or Diploid parthenogenesis -

1. In this diploid eggs developed parthenogenetically to form diploid parthenote.
2. Diploid generation is always female.
3. In this meiosis not take place during gametogenesis.
4. eg. Aphids, Daphnia, Nematods, Rotifers, Trematodes etc.

2.       ARTIFICIAL PARTHENOGENESIS -

1. Artificial parthenogenesis can be induced by shaking, puncture, chemicals (KCl, CO , weak acid, weak base), changes in temperature & changes in osmotic pressure.
2. Loeb studied in frog parthenogenetically ova to sexual maturity.
3. In Lacerta Sexicola lizard eggs are diploid and develop into female. The male are absent.

Posted Date: 10/3/2012 8:48:13 AM | Location : United States

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