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

Define protein requirements during sepsis, Define Protein Requirements duri...

Define Protein Requirements during Sepsis? Adequate amount of protein is required by these patients to improve immunity against infections, promote recovery, spare lean body ma

Explain risk evaluation, Explain Risk  evaluation Risk  evaluation: Th...

Explain Risk  evaluation Risk  evaluation: The  risk  evaluation involves: A) identification of a food safety problem B) Establishment of a risk profile C) Ranking of

Explain about anterior superior alveolar nerve, Anterior superior alveolar ...

Anterior superior alveolar nerve It is a branch of infraorbital nerve which arises within the infraorbital canal. It gives a nasal branch which passes into nasal cavity to supp

Vitamin - k, VITAMIN - K Also known as naptho quionone / anti haemo...

VITAMIN - K Also known as naptho quionone / anti haemorrhagic vitamin / coagulation vitamin / menadone . It requires for formation of blood clotting factor prothrombin.

Conditioned reflex , CONDITIONE D REFLEX - Response which is achiev...

CONDITIONE D REFLEX - Response which is achieved by training is conditioned reflex. I. P. Pavlov in 1920 displayed it by experimenting on dog. These are voluntary in

Bque, what is working of heart

what is working of heart

What are ganglia, What are ganglia? Ganglia (singular ganglion), or neu...

What are ganglia? Ganglia (singular ganglion), or neural ganglia, are structures located outside the central nervous system (for instance, beside the spinal column or near visc

Explain about the lignans, Explain about the Lignans? Lignans are diphe...

Explain about the Lignans? Lignans are diphenolic compounds formed by dilnerization of 2 cinnamic acid residues. Most lignans apparently pass through the GIT as fibre. Some lig

Describe infection control sterilization protocol, Q. Describe Infection co...

Q. Describe Infection control sterilization protocol? Today is the age of modern technology coupled with medical challenges. Pervasive increase in serious transmissible disease

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