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Is crossing over important for the diversity of biological evolution?
Sexual reproduction and recombination of linked genes (crossing over) are, with mutations, the main instruments of biological variability. Sexual reproduction allows many combinations among genes situated in different chromosomes. Crossing over, though, is the only means to provide recombination of alleles located in a similar chromosome. Crossing over probably emerged and has been maintained by the evolution because of its importance to biological diversity.
What are the functions of biotin and pantothenic acid for the body? How are these vitamins obtained? Biotin (also called as vitamin B8) is a vitamin that acts in the metabolism
Circulatory System Coelenterates and platyhelminths nutrients in sponges, respiratory gases and waste materials can easily diffuse through the intercellular spaces. Though, in
Define Recommended Intake of Fibre? 1. A minimum of fibre intake of 20 g/day is recommended by the American Dietetic Association (ADA), the National Cancer Institute, US and th
significance of radial symmetry
Where in the leaves is the photosynthetic tissue often located? The major photosynthetic tissue is the photosynthetic parenchyma (also called as chlorenchyma, do not confuse wi
Define Bone growth and development calcification of osteoid tissue? Vitamin D participates in metabolic processes associated with bone growth and development. It is involved i
Q. Explain Cytological Evidence? Cytology is the study of the morphology and physiology of cells. The information about the chromosome number, shape and pairing at meiosis is u
Why are glucorticoids used in transplant patients? Patients with transplanted organs are prone to host versus graft rejection as their own immune system tends to attack the gr
Quantitative changes The quantitative changes in the availability of the active biomolecules occur in order to compensate for the loss of efficiency of the system caused by th
Identical Twins Human twins may be similar, when they are formed from one egg (monozygotic) or fraternal while they are the result of fertilization of two different ova releas
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