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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 is the difference between recessive allele and dominant allele? The Dominant allele is the allele that determines phenotypical features that manifest in heterozygous or ho
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Spermatogonia Spermatogonia are the youngest germ cells from which spermatozoa proliferate. These lie next to the basement membrane and undergo series of mitotic divisions lea
How we explain intenal organs when we talk about symmetry??Is there any animal that is completely symmetric even insid the body?
General characters of phylum protozoa
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what is the phylum protozoa and when he was discover
what is the population for percentage of people being overweight
Define Classification of Chromatography - Basic Separation Technique Chromatography can be classified depending upon: Physiochemical principles/factors, The techniqu
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