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

Cleavage, what are the chemical changes during cleavage

what are the chemical changes during cleavage

How do you define normal pulmonary vasculature, Q. How do you define Normal...

Q. How do you define Normal Pulmonary Vasculature? Pulmonary vessels are seen in the medial 2/3 of the lung. Vessels are generally not identified in the lateral third. The rad

What are the properties og gel, What are the properties og Gels? Polysa...

What are the properties og Gels? Polysaccharides, proteins or colloidal complex particles, such as caseinate micelles  form gels at levels of 10% or less. Gums, pectin and gela

How hyperventilation affect blood ph, Freediving is an activity in which a ...

Freediving is an activity in which a person dives, sometimes to great depth, without the use of scuba gear. The diver must hold his or her breath for the duration of the dive. (The

Internal and external respiration, External Respiration: Diffusion of...

External Respiration: Diffusion of oxygen into blood and carbon dioxide into alveoli (external respiration)  is the diffusion of oxygen from air in  the alveoli of lungs to bl

Long-day plants (ldp) - plant responses to light-dark cycles, Long-Day Plan...

Long-Day Plants (LDP) - Plant Responses to Light-Dark Cycles The definition of this is exactly opposite to short-day plant. That is those plants which flower when given more t

State the concept of finger tapping, State the concept of Finger Tapping ...

State the concept of Finger Tapping The subject is asked to tap his or her extended index finger on a typewriter key attached to a mechanical counter. Several series of 10-seco

Taxonomy, what is the taxonomic classification for the protist Archaeplasti...

what is the taxonomic classification for the protist Archaeplastida?

Explain lipase, Lipase Pancreatic lipase specifically  hydrolyses the p...

Lipase Pancreatic lipase specifically  hydrolyses the primary ester linkages i.e.  at the position 1 and 3 of triacylglycerols. The presence of bile salt helps  in  emulsificat

Explain the basic concept of adulteration, Explain the Basic Concept of Adu...

Explain the Basic Concept of Adulteration? Food adulteration is the change in original composition and quality of food by adding, removing or substituting some ingredients of f

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