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

What are the major types of animal tissue, Q. What are the major types of a...

Q. What are the major types of animal tissue? The major animal cell tissues are the epithelial tissue, the nervous tissue, the connective tissue and the muscle tissue.

Vitamins requirements for ulcerative colitis, Q. Vitamins requirements for ...

Q. Vitamins requirements for ulcerative colitis? Vitamins: Commercial multivitamin preparation should be administered orally especially the ones needed for the healing process

Discuss resting membrane potential and nerve action potentia, Question 1 W...

Question 1 Which are the 3 different processes in the formation of urine? Explain Question 2 Discuss resting membrane potential and nerve action potential Question 3 Nam

Activation of a fatty acid, Small-  and  medium-chain   acyl  CoA  molecule...

Small-  and  medium-chain   acyl  CoA  molecules  (up  to  10  carbon  atoms)  are readily capable to cross the inner mitochondrial  membrane by diffusion. Furthermore, longer chai

What is biosynthetic pathways, The intermediates in the cycle give precurso...

The intermediates in the cycle give precursors for various biosynthetic pathways. An instance is as given below: -  From citrate synthesis of fatty acids; -  Amino acid synth

Female reproductive system - graffian follicle, GRAFFIAN FOLLICLE - ...

GRAFFIAN FOLLICLE - It appears as knob or stigma in medulla. It is round, discovered by Graff. It is covered by 2 layers - thecae externa & theca interna. From theca i

Into which classes are mollusc divided, Q Into which classes are mollusc di...

Q Into which classes are mollusc divided? What are some representing beings of each class? The phylum Mollusca is divided into five main classes: pelecypods, or bivalves (Pelec

What is increase in the second messenger, When glucagon binds its receptor ...

When glucagon binds its receptor there is an increase in the second messenger, cAMP. cAMP levels can be decrease by which of the following enzymes? -adenylate cyclase -PDK1

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