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

Show characteristics of food products, Q. Show characteristics of food prod...

Q. Show characteristics of food products? These sensory characteristics of food products. Food quality, as such, can be divided into three main categories i.e. i. Appeara

Mollusca, what is phylum mollusca?

what is phylum mollusca?

Cytosol of prokaryotes, The  citric  acid  cycle  functions  in  the  mitoc...

The  citric  acid  cycle  functions  in  the  mitochondria   of  eukaryotes  and  in  the cytosol of prokaryotes. The Succinate dehydrogenase, the only membrane-bound enzyme   in t

When staphylococcal occur, Staphylococci exist in air, dust, sewage, water,...

Staphylococci exist in air, dust, sewage, water, milk and food or on food equipment, environmental surfaces, humans and animals. Humans and animals are the primary reservoirs. Stap

Class arachnida of phylum arthropoda, Class Arachnida of Phylum Arthropoda ...

Class Arachnida of Phylum Arthropoda Body divided into cephalothorax and abdomen. Cephalothorax along with four (4) pairs of legs; abdomen segmented or unsegmented, with or wi

Describe about water expulsion vesicle, The water expulsion vesicle (also k...

The water expulsion vesicle (also known as a contractile vesicle) is an important osmoregulatory organelle in freshwater protists, which are hyperosmotic to surrounding water. Wate

Design a microcontroller-based system, Suppose you are in charge of designi...

Suppose you are in charge of designing a microcontroller-based system for a packet processing application. These are high speed internet packets from the PC that are going to be pr

Explain the pseudomonas - characteristics of bacteria, Explain the Pseudomo...

Explain the Pseudomonas - Characteristics of Bacteria? Pseudomonas are aerobic, gram negative, straight or slightly curved rods that are motile by polar flagella. Many species

Brain region responsible for the equilibrium of the body, Q. Which is the b...

Q. Which is the brain region responsible for the coordination and equilibrium of the body? In the central nervous system the cerebellum is the main controller of the motor equi

Irritability, Irritability If a bright torch of light is flashed acros...

Irritability If a bright torch of light is flashed across your eyes, you close your eyes instinctively. The bright light acts as a stimulus (pl, stimuli) and closing your eyes

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