Barriers to fertilisation, Biology

Barriers to Fertilisation

Incompatibility can occur anywhere from pollination to syngamy and consequently obstructing fertilisation. The pollen fails to germinate or the pollen tube is inhibited to penetrate the stigma.

The progamic barriers to fertilisation may be on the stigma or in the style at any level from pollen germination to the discharge of male gamete in the vicinity of egg.

On the other hand, syngamy barriers include the inhibition of the entry of pollen tube to the ovary, ovule or within embryo sac. At the stage of pollination the barriers to fertilisation are of morphological and ecological types, whereas, at progamic phase and syngamy physiological barriers occur.

Posted Date: 1/23/2013 4:54:08 AM | Location : United States







Related Discussions:- Barriers to fertilisation, Assignment Help, Ask Question on Barriers to fertilisation, Get Answer, Expert's Help, Barriers to fertilisation Discussions

Write discussion on Barriers to fertilisation
Your posts are moderated
Related Questions
What are the special considerations required to be taken in maintenance of implants? The procedures for maintenance of patients with implants are similar to those with natural

What is the meaning of Schizogony? A form of asexual reproduction found in some protozoans. An already multinucleated cell undergoes cell division which results in each daughte

The law of contract is that the branch of law which determines the circumstances in which promises made by the parities to a contract shall be legally binding on them. Its rules de

Define Changes in Gluten Proteins during Dough Formation? Initially, gluten is formed when flour and water are mixed together. The proteins in the flour, glutenin and gliadin c

TYPE S OF RIBOSOMES Ribosomes are of two types: - 1 . Procaryotic Ribosomes - 70 s = Occur in cytoplasm of prokaryotes, and also in mitochondria, and Chloroplast o

Q. Requirements of vitamins during congestive cardiac failure? Vitamins: The requirements of all vitamins remain the same as per the RDI. If the patient is also suffering from

Define the V2 receptor antagonist A new drug named ANTI-V2R has been developed that is a V2 receptor antagonist.  When ANTI-V2R binds to a V2 receptor, there is no binding of v

Determine Protein needs during pregnancy period? Altogether, 925 g of protein are deposited in a normal foetus and maternal accessory tissues and considering the dietary protei

State in brief about the Comprehensive neuropsychology Comprehensive neuropsychology testing needs a combination of Context related ideometric and quantitative psychometric app

Q. What is Moderate level of Lactase activity? Intake of milk is restricted depending on the tolerance. Fermented and cooked form of milk should be preferred as it is better to