Write the difficulties in application of biological species concept
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the following three points highlights most serious difficulties faced in the application of biological species concept
1) insufficient information = sexual dimorphism age difference polymorphismand other such type of variations often give rise to doubts as to weather a certain morphotype is a separate species or only a phenon within a variable population.
2 uniparental reproduction= self fertilization ,parthenogenesis pseudogamy ,vegetative reproduction are some forms of uniparental reproduction that do not fulfill the criteria of interbreeding .as per definition, a population is an interbreeding group, and therefore the term population in "an sexual biological population is a contradiction
the biological species concept based on the presence or absence of interbreeding between population is, therefore inappropriate for uniparental reproducing organism
how to solve the dilemma has been s
discussed by Simpson (1961) and by mayr (1963) fortunately there are usually well defined morphological discontinuities are apprently produce by natural selection among the various mutants which occurs in the asexual clone
3 evolutionary entermediacy = it is important for a taxonomist to have a through knowledge of all stages of differentiation between the individual variant and the well characterised distinct biological species .many species pass through intermediate stages like biotype ,races ,subspecies ,ecotypes or semi species .
in such incipient speciation population will be found which are in the process of becoming separate species and have acquired some but not yet all of the attributes of distinct species .rhe taxonomist .thus may encounter various difficulties which may result from such evolutionary Intermediacy.
1) insufficient information = sexual dimorphism age difference polymorphismand other such type of variations often give rise to doubts as to weather a certain morphotype is a separate species or only a phenon within a variable population.
2 uniparental reproduction= self fertilization ,parthenogenesis pseudogamy ,vegetative reproduction are some forms of uniparental reproduction that do not fulfill the criteria of interbreeding .as per definition, a population is an interbreeding group, and therefore the term population in "an sexual biological population is a contradiction
the biological species concept based on the presence or absence of interbreeding between population is, therefore inappropriate for uniparental reproducing organism
how to solve the dilemma has been s
discussed by Simpson (1961) and by mayr (1963) fortunately there are usually well defined morphological discontinuities are apprently produce by natural selection among the various mutants which occurs in the asexual clone
3 evolutionary entermediacy = it is important for a taxonomist to have a through knowledge of all stages of differentiation between the individual variant and the well characterised distinct biological species .many species pass through intermediate stages like biotype ,races ,subspecies ,ecotypes or semi species .
in such incipient speciation population will be found which are in the process of becoming separate species and have acquired some but not yet all of the attributes of distinct species .rhe taxonomist .thus may encounter various difficulties which may result from such evolutionary Intermediacy.
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