Introduction to reproduction | Sexual And Asexual Reproduction | Class 12 Biology

Introduction to reproduction | Sexual And Asexual Reproduction | Class 12 Biology
About This Video ........................
In This Video Lecture You Will Learn Basic Concept Reproduction
Every species of organisms can reproduce new individuals of that species. In organisms, methods
the chromosome number in a species but also produces genetic variations, an important factor in
gametophyte, meiosis occurs during spore formation (sporogenesis).
organisms of valuable characteristics, without a change in their genetic make up. Cloning has been maintains a species-population.
Reproduction is of two types, asexual reproduction and sexual reproduction. Asexual reproduction of reproduction are varied and some are quite complex. It is very important to the survival of Sexual reproduction usually involves two parents. A fertilized egg is produced through the union of In plants, if there is alternation of generations namely a diploid sporophyte and a haploid
stress and diseases are still the limitations for commercial ventures. Also it is still not being accepted requires only a single parental organism which gives rise to offspring by mitotic cell division, during and apomixis etc.
division gives rise to gametes (gametogenesis) in which not only the chromosome number is
In asexual reproduction, although increase in number of genetically alike individuals from a parent
the survival and adaptation of a species or a population .
is very rapid but this is not an adaptive method and may at some stage jeopardize the survival of
halved (haploid) but reshufling of genes leads to recombination of genes. This not only maintains
meiotically produced specialized sex cells (egg and sperm) from each parent. Meiosis or reduction
are fission, sporulation, budding, vegetative propagation, artificial propagation, parthenogenesis
a species. Man has favoured this type of reproduction for his own needs, commonly in plants but
cells, so that the offspring are genetically identical to the parent. Methods of asexual reproduction
practiced successfully but its disadvantages like rapid aging and low resistance to environmental
now tissue culture technique in plants and cloning in animals are being adopted for producing
a species or a population. Reproduction is the mechanism that- produces new generations and which the total chromosomes content of the cell is exactly replicated and passed on to daugher socially and morally in general.
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