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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.
Nutrition of Embryo - In Vivo Studies The young proembryo derives its nutrition from ovular tissues with the help of suspensor. As the embryo develops its suspensor degenerate
Diabetic foot are impaired blood supply to foot Diabetic foot are impaired blood supply to foot i.e. vasculopathy. This leads to ischaemia which in turn leads to delayed or non
How are fruits formed? The fecundation in angiosperms triggers the release of hormones that act upon the ovaries. The ovary wall then makes into a fruit that having the seeds.
Q. How are ecological interactions classified? Ecological interactions are classified as interspecific or intraspecific interactions and as harmonious or inharmonious interacti
Determine the Parts of Stethoscope A stethoscope having of earplugs, binaural pieces, flexible tubing, a stem, and a chest piece. The earplugs are attached to springs made of s
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Which one of the following is an example of a tree having simple leaf ? 1. Neem 2. Rose 3. Mimosa pudica 4, Peepal.
Vitamin A (Retinol) Purified vitamin A is a viscous yellowish oil. It is freely soluble in most organic solvents such as methanol, ether, acetone, chloroform and petroleum ethe
Select all of the correct/true answers. The rate of mutation of a given species can be predicted. Mutations are a source of new alleles and contribute to the biodiversity present o
Explain the Tissue Synthesis for Wound Healing in Nutritional Care? Tissue proteins are synthesized only by amino acids brought to the tissues by circulating blood. The necessa
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