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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.
Determine the Functions of Organ during pregnancy? Dramatic changes occur in renal functions to eliminate the nitrogenous and other waste products of maternal and foetal metabo
URINARY BLADDER - Pear shaped sac like. Situated in pelvic region of abdominal cavity. Ventrally placed. Lined by transitional epithelum. Detrusor muscle i.e. to expell out
How different are reptiles and birds concerning the maintenance of body temperature? Are birds rare in polar regions? Reptiles are heterothermic, i.e., they do not control thei
PULSE Pulse frequency and heart rate are identical i.e. 72. It can be felt in superficial arteries as in wrist (radial artery [thumb] and ulner artery of brachial art.),
Q. Is there an exchange of cells between the mother and the fetus through the placenta? Under usual conditions there is no passage of cells across the placenta during gestation
Acyanotic Congenital Heart Disease In this infant has no cyanosis because there is no abnormal communication between pulmonary and systemic circulation or there is no mixing
Explain the Magnesium Deficiency and Toxicity? Deficiency of magnesium is rare for two reasons: frstly, the mineral is widely distributed in the foods, secondly, kidney is able
Describe about the Primary Prevention - Food Allergy? Let us further, dwell on measures we could adopt in primary, secondary and tertiary prevention. Current research in primar
Denitrification - Nutrient Cycles Nitrates are readily leached from the soil and also lost through denitrification the process by which molecular or gaseous nitrogen (N 2 ) as
What is Biomaterial Biomaterial is defined, in the broader sense, as any pharmacologically inert material that is capable of interacting with a living organism without causing
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