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

Nitrogen cycle, Nitrogen is very important constituents of all organisms li...

Nitrogen is very important constituents of all organisms life  because it forms the structural parth of proteins, nucleic acids and chlorophyll molecules.               Earth 's

Are the limbs modified into wings of bats, Are the limbs modified into wing...

Are the limbs modified into wings of bats and the wings of birds examples of evolutionary analogy or homology? What about whale fins compared to fish fins? Bat and bird wings h

What is the difference between a hormone and a morphogen, What is the diffe...

What is the difference between a hormone and a morphogen? How do they act and what type of development do they control?

FISHERIES, describe the endoskeleton of fish?

describe the endoskeleton of fish?

Syngamy and triple fusion, Syngamy and Triple Fusion After traversing...

Syngamy and Triple Fusion After traversing through the stylar region, the ultimate destination of the pollen tube is to reach the female gametophyte and release the male game

How is the nervous tissue distributed in cnidarians, Q. How is the nervous ...

Q. How is the nervous tissue distributed in cnidarians? Their nervous system is diffuse there are no ganglia or brain. Q. What are the kinds of reproduction presented by cn

Determine the causal factors of nervous system, Determine the Causal factor...

Determine the Causal factors of nervous system Although, the brain and spinal cord are surrounded by tough membranes, enclosed in the bones of the skull and spinal vertebrae, a

Appendical skeleton, it consists of the girdles and the skeleton of the lim...

it consists of the girdles and the skeleton of the limbs

Diet of a msud patient, The diet of a MSUD patient (child) should therefore...

The diet of a MSUD patient (child) should therefore involve: • Measured quantities of natural protein or leucine from foods. • A BCAA free protein, vitamin and mineral supp

What are the parts of a surgical needle, What are the parts of a surgical n...

What are the parts of a surgical needle. How do you classify surgical needles The surgical needle is comprised of 3 parts: the needle point, the needle body, and the swaged (pr

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