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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.
Morphogenesis and Totipotency A chlamydomonas mother cell gives rise to two daughter cells by a simple division. But a leaf cell cannot give rise to a new plant except in cas
Associated nerves and vessels The Anterior superior alveolar, Infraorbital, and Posterior superior alveolar nerves and arteries provide both the innervation and blood supply to
Q. What is the difference between primary ecological succession and secondary ecological succession? The Primary ecological succession is the changing sequence of communities f
Why are some types of hemorrhagic diseases caused by genetic or acquired deficiency of the vitamin K metabolism? Lack of vitamin K predisposes to hemorrhages as this vitamin i
Explain ozone shield? Name two gases that can cause damage to this shield. Give one harmful effect of this damage each on plants and animals.
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discuss why obelia is considered to be of special interest in zoology as an animal showing an intermediate grade of organisation
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