causes of variation -effect of environmental
CAUSES OF VARIATION -
Effect of environmental conditions
Change in the gene pattern like -
(a) Random distribution of homologous genes in meiosis
(b) Crossing over
(c) Dual parentage
(d) Random union of gametes during fertilization
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population genetics and evolution-population is the number of all individual of same species in a defined area at a particular time as per modem
hardy - weinberg law -proposed by gh hardy and w weinberg in 1908 independentlythe law states the frequency of genes or alleles in a population
variations -defined as dissimilarities of features among members of the same speciesoffsprings of same parent are different and also differ from
types of variations -somatogenic and blastogenic variationchanges in somatic parts of the body are somatic variations eg wrestlers muscle circumcised
causes of variation -effect of environmental conditionschange in the gene pattern like -a random distribution of homologous genes in meiosisb
artificial selection -man selects the individuals having the desired traits and separates them from those which do not possess such charactersthe
difference between artificial selection and natural selection -snoartificial selectionnatural selection1it is an artificial processit is a natural
reproductive isolation -according to the biological species concept members of one species are reproductively isolated from members of all other
speciation -origin of new species an isolated population of a species independently develops different types of mutationsthe later accumulate in its
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