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Mutations are the only kind of variability generating mechanism in prokaryotes and asexually reproducing organisms. But in eukaryotes where sexual recombination occurs, even in one generation there is a marked reshuffling of genes in the chromosomes which amplifies the genetic variability in a population. The kind of variability generated by recombination is tested by natural selection in as many genetic backgrounds as possible and in as short time as possible (say in one generation). Thus one of the greatest and fundamental advantages of sexual reproduction is the generation of variability. Provided the populations are large, even if mutations do not exist, the mechanism of sexual recombination alone would be generating new genotypes for very long time.
cephalization
Q. How different is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made o
Which of the following serves as an effector, or part of an effector, that functions in a negative feedback system? A. 1,25-dihydroxyvitamin D Receptors located intracellularly
Explain Scope of Food Science and Technology as a Subject? Food science and technology has developed as a discipline to systematically organize and link various kinds of knowle
Benthic Zone - Organisation of the Marine Ecosystem The benthic zone is divisible into sub zones horizontally. These are depicted in a cross section portion of the marine habi
Define some Essential facts about the Fats? 1) Fats are essential in diets to facilitate satiety, high-energy intakes, and absorption of fat-soluble vitamins and provide essent
A restriction map of plasmid and a human gene of identified sequence is demonstrated below. Your job is to clone the human liver cDNA for that gene than the start codon is closer t
Q. What are the major characteristics of the bryophytes? Bryophytes are nonvascular plants that is they do not have conductive tissues and they perform transport of nutrients a
Disadvantages of Protozoa
Cellular respiration is the transfer of energy from various molecules to produce ATP; takes place in the mitochondria of the eukaryotes, the cytoplasm of prokaryotes. In the proce
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