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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.
what are the disadvantages of protozoa?
Establishment of Tissue Cultures By now you are familiar with the term "Explants". After a few days in culture the explant becomes slightly rough in texture and its surface g
Global Air Circulation The major wind systems of the earth result because large masses of air around the earth's equator are forced to rise from the bottom due to surface heati
Explain in brief about the Trail Making Test In part A of this procedure the subject must connect in order a series of circled numbers randomly scattered over a sheet of 81\2 X
How does the swim bladder of fishes work allowing fishes to control their depth under water? From Hydrostatics it is called that an object does not sink if its density is equal
What is Intermittent ST Depression ? Ans. Several patients progress from variable ST-segment depression, often associated with respiration, to the classic ST-segment chang
DIFFERENCE S BETWEEN SINGLE-UNIT AND MULTI-UNIT SMOOTH MUSCLES Single-unit Smooth Muscles Multi-uni t Smooth Muscles
What are organelles, which carry out autophagy? Autophagy, being the degradation of cytoplasmic components as well as other organelles, is usually done with the lysosomes. The
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Functions of Synergids Ultra structurally the structure and concentration of cell organelles reveals that synergids are metabolically active. The following Wee functions are a
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