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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.
Types of gastrulation
how is sex determinedin man.
Explain some Handy Points related to Infant Feeding? Points to be kept in mind: • Introduce only one food at a time, giving only small amounts at first • Increase variety s
Q. Can you explain Salmonellosis Salmonellosis is a common food bome disease all over the world. There are approximately 1600 different strains (sero types) of Salmonell
You have 200 cells and find 120 in interphase, 57 in prophase, 8 in prometaphase, and 5 in metaphase, 8 in anaphase and 2 in telophase. (None in G0 phase). it takes 18 hours to com
Cover (area occupied) - Quantitative Characters Cover or specifically herbage cover refers primarily to the area of ground occupied by the leaves, stems and inflorescence i.e.
The risk for IE among IV drug abusers, 2 to 5 per cent per patient- year, is estimated to be several fold greater than that of patients with rheumatic heart disease or prosthetic v
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what is binomial nomenclature? What are the importance of it?
Write up your own Matlab program to do the job described by Show">http://www.avatar.se/molbioinfo2001/dynprog/adv_dynamic.html Show a few examples, your code does work. You wil
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