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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.
Q. What is the kind of circulatory system present in arthropods? Do these animals have respiratory pigments and heart? In arthropods the respiratory system is open (lacunar). B
Explain briefly how computed tomography (CT) helps the doctors in pinpointing the defects in the patient's body
Water is an essential commodity for survival of life on these plants. The circulation of water and moisture between living organism, atmosphere and earth is called as water cycle
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Fatty acid breakdown happens in the cytosol of prokaryotes in plants in peroxisomes and in the mitochondrial matrix of all other eukaryotes. By entering the mitochondrial matrix,
Define some adverse effects of saponins? The adverse effects of saponins may be described as under: - A well-known toxic effect is 'erythrocyte lysis' since they interact wi
give an account of ciliary and flagellar movement in protozoa
case study
Sympatric speciation can be regarded as speciation where parent species gives rise to a daughter species without the individuals of a species being separated by space or territory.
by our eyes we can see the beautiful world but is there anything in our eyes which makes it beauiful??
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