Parthenogenesis, Biology

Parthenogenesis

The diploid egg produced in the embryo sacs during diplospory and apospory develops into an embryo without fertilization, thus maintaining the sporophytic level of chromosomes. This process of embryo development from an unfertilized egg is called parthenogenesis. The stimulus to form embryos may be pollination dependent. For example, in grasses pseudogamy operates that involves pollination stimulus while in apomictic taxa of Asteraceae and Rubiaceae no such stimulus is required. Pseudogamy has been credited with:

  • Supply of male nucleus for endosperm development,
  • Activation of growth of ovule and ovary, and
  • Stimulation of parthenogenesis.

 Pollination even otherwise is reported to initiate the development of adventive embryos of Citrus. Likewise, parthenogenetic development of embryo proceeds in apomictic grasses but normal embryos results only when endosperm is also formed.

Posted Date: 1/23/2013 6:21:23 AM | Location : United States







Related Discussions:- Parthenogenesis, Assignment Help, Ask Question on Parthenogenesis, Get Answer, Expert's Help, Parthenogenesis Discussions

Write discussion on Parthenogenesis
Your posts are moderated
Related Questions
Q. What are some examples of parasitism? The Classical instances are the parasites of humans (host), like the trypanosome that causes Chagas' disease, the HIV virus (AIDS), the

Examination is begun by placing the transducer in left parasternal region, usually in the third or fourth left intercostal space. From this position, a sector image of the heart

Mode of nutrition of a rabbit

WHAT IS THE FUNCTION OF CELL COAT

Use of repellents Avoidance and early removal of ticks are the first steps in prevention of Lyme disease. In highly endemic areas, when an engorged Ixodes scapularis tick is at

Define the Essentiality of Carbon for the Growth of Microorganisms Carbon is needed for the skeleton of all organic molecules. Microorganisms acquire it either as inorganic car

Describe Structure of biological compounds? Structure :  The most important chemical compounds in living systems are probably the organic compounds. The term "organic" in the

Q. Systolic dysfunction onset of symptoms? In asymptomatic patients with normal LV function, the rate of progression to symptoms and/or LV Systolic dysfunction is about 4 per c

What are melanocytes? Melanocytes are epithelial cells of the skin particular in secretion of melanin. Melanin is a pigment that besides coloring the skin, the iris of the eye

Myasthenia Gravis Myasthenia gravis (severe muscle weakness) is characterised by muscular fatigue in the wake of very little exercise. It may be apparent after a short period o