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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.
Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?
Eugenics : This is the study of improvement of human races by applying the genetic laws. In other words Eugenics is the bio-social movement & applied science that advocates the use
Ribo Nucleic Acid contains OH group at second carbon where as Deoxyribo Nucleic Acid lacks OH group at Second carbon.....DNA is Double standed helix whereas RNA is single stranded
what is photosynthesis
Neutral fat & oils These are triglyceryde compounds. 1 molecule of neutral fat consists of 1 molecule of glycerole and 3 molecule of fatty acids. 3 ester bo
Compare and contrast covalent and ionic bonds in molecules, give an example of each.
WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL
What is genetic drift?
Q. How CAD Patients Response in Hypertenstion? An exercise rise in systolic blood pressure (over 200 mm Hg) has been used as a reason to terminate exercise in some centers. She
The original DNA sequence when ,transcribed and translated would yield five successive valine residues. But the altered sequence would correspondingly read one aspartate and four s
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