Hybrid sterility, Biology

Assignment Help:

Hybrid sterility can be regarded as yet another form of interspecific sterility. The offspring of the interspecific crosses are mainly sterile. Geological studies have shown that the chromosomes of the hybrid individuals fail to synapse at the time of meiosis and thus result in either non-production of gametes or defective gametes. Unless the chromosomes of parents are accurately separated which might result in viable gametes,, in most cases the gametes are not produced and if produced they may not be fertile. The commonly cited example is the mule, a sterile animal the product of a cross between a donkey and a horse. Further, the hybrid species in general are found to have grossly abnormal reproductive system. If normal reproductive system is present, then meiosis is abnormal and non-viable gametes are produced. Thus various types of reproductive isolating mechanisms are at work in different groups of organisms to maintain the distinctness and uniqueness of species.


Related Discussions:- Hybrid sterility

Interactions between minerals, Interactions between minerals Copper de...

Interactions between minerals Copper deficiency has been identified as a serious problem for grazing ruminants. A deficiency may be due to low concentrations of Cu in forage a

What are the proteins, Q. What are the proteins? How can the protein divers...

Q. What are the proteins? How can the protein diversity of living beings be described? Proteins are molecules made of sequences of amino acids bound by a peptide bond. The g

Factors affecting the rapeutic relationship, FACTORS AFFECTING THE RAPEUTIC...

FACTORS AFFECTING THE RAPEUTIC RELATIONSHIP: A  rapport  is developed between the nurse and  the patient. Rapport  is defined as, a relationship of mutual sympathy and underst

Which is needed to stimulate the activity, Synthesis of fatty acids require...

Synthesis of fatty acids requires the movement of citrate out of the mitochondria. This occurs under conditions of high levels of acetyl CoA which is needed to stimulate the activi

Classification, discuss about protozoa,metazoa,mesozoa and parazoa

discuss about protozoa,metazoa,mesozoa and parazoa

Oxygen stratification - lake ecosystem, Oxygen Stratification - Lake Ecosys...

Oxygen Stratification - Lake Ecosystem In most lakes, oxygen stratification nearly parallels that of temperature during the summer season. The amount of oxygen is greatest on

Metabolism of lipids, The three main forms of fat found in food are glyceri...

The three main forms of fat found in food are glycerides (principally triacylglycerol [triglyceride], the form in which fat is stored for fuel), the phospholipids, and the sterols

Importance of nutritional interaction, Importance  of nutritional interact...

Importance  of nutritional interaction :- Now  being  realized.  Some  nutrients  are antagonistic to each other whereas others act synergistically. Examples of uniquely related

Determine fragment of nucleic acid has a nucleotide sequence, If a fragment...

If a fragment of nucleic acid has a nucleotide sequence TAC can one assert that it is a codon or an anticodon? A nucleic acid having a TAC sequence surely is not tRNA, it is DN

Cell cycle, What can stop a normal cell from growing?

What can stop a normal cell from growing?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd