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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.
Benzathine penicillin given every three weeks as IM injection (1.2 mega units) has given the best results. Oral agents (penicillin V) are given in patients with lower risk of rheum
COMMON RESPIRATORY DISORDERS: Respiration is one of the most vital functions of the body. The purpose of respiration is to provide oxygen ta the body cells and to remove exc
Tumor Suppressor Genes Tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes. The very existence of these genes prevent
Q. Primary prevention of diabetes mellitus? Approaches to Prevention: There are various approaches to prevention. Four levels of prevention related to different stages of a di
How Body size and composition affecting the BMR? Basal and resting energy expenditures are related to body size, being most closely correlated with the size of the fat-free mas
What is deplasmolysis of plant cells? The plant cell when placed under hypertonic medium loses a huge amount of water and its cell membrane detaches from the cell wall. In that
Arterial Conduits LIMA UMA: anastomosis side-t-side with diaganal8 end-lo-sode with LAD Figure: Arterial conduits Internal Mamnrary Artery (IMA)
When comparing the DNA of a calfs liver and thymus, which would be predicted to have more DNA and why? What are the differences of the DNA between the two?
Given the cell described in Figure 7.7 with a=100mM, Pk=1.0, and PNa=0.04, at steady state, plot the relationship between Jp and V.
what is the life cycle of a protozoa
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