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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.
The best way to maintain quality of air and pollutant's emissions is by using less polluting fuels and processes. Following can be taken to control air pollution. Source correc
Contact Osteogenesis In this the osteogenic cells attach to the implant surface and the new (de novo) bone is formed on the implant surface first. The developing bone matrix c
The standard free energy change and standard activation energy for four biochemical reactions are listed in the table below: A few interpretations are given below. Between thes
Explain About the High Risk Pregnancies? Until now we have considered the nutritional needs of pregnant women. In this sub-section, we will consider specific conditions that co
Describe the clinical significance and symptoms of edema. How does edema (in its different forms listed in your text) appear on medical imaging examinations? Discuss any specific c
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I am trying to get help on the creation of a dataset for protein prediction in matlab
BLOOD COAGULATION - DEFINITIO N - The property of blood to change from fluid to gel state within a few minutes of its coming in contact with air is called blood coag
I need help with making a taxonomic key
Merits of Micro Propagation The special merits of micro propagation are: 1. It considerably increases the rate of multiplication 2. High rate of multiplication can be ma
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