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

Neurofilaments and microtubules - nervous system, Normal 0 fals...

Normal 0 false false false EN-IN X-NONE X-NONE

Zoology, find the habits and habitats of scyphas?

find the habits and habitats of scyphas?

Illustrate the molecular composition of hemoglobin, Q What is the molecular...

Q What is the molecular composition of hemoglobin? Does the functionality of hemoglobin as a protein depend upon its tertiary or upon its quaternary structure? Hemoglobi

What do you mean by endemic goiter, Q. What is a goiter? What is endemic go...

Q. What is a goiter? What is endemic goiter? How this problem is socially solved? Goiter is the abnormal enlargement of the thyroid gland the goiter appears as a tumor in the a

Evolutionary implications of natural regulation, Evolutionary Implications ...

Evolutionary Implications of Natural Regulation Many changes in abundance can be attributed to changes in extrinsic factors such as weather, disease or predation. But some cha

What is the main theory opposed to evolution?, What is the main theory oppo...

What is the main theory opposed to evolution? The major theory that opposes the evolution theory on the explanation of how species emerged (phylogenesis) is fixism.

Subcostal views, In addition to parasternal and apical transducer position....

In addition to parasternal and apical transducer position. Subcostal view also provides imaging window in adult patients. The patient is supine with knees flexed to relax the abd

What information must be included on the form, Submission of evidence items...

Submission of evidence items to the forensic laboratory requires that a specific "Evidence Submission Request Form" be completed. What information should be included on the form?

Evaluation of nursing process, Evaluation This is the last step in nur...

Evaluation This is the last step in nursing process. Throughout care, you constantly evaluate the progress the client has made towards reaching the pre-established goals/ ob

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