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yes it might be...well definition of excretion says removal of waste poducts of metabolism that are toxic (e.g urea) or in excess.....cn u name a product which is excess.....i guess water ll be one.....is co2 also an excess product?
y cant i download the notes for bio?chek revison guide....its a hundred pages.......http://studyguide.pk/?p=431
normalhows prep for bio guys...????
i cant download it..if i click the download option it opens up some warning. help plz?chek revison guide....its a hundred pages.......http://studyguide.pk/?p=431
allopatric speciation is the geographic speciation of organism where they r totally separated from eachother due to some physical barrier formation b/w the population...so the two population formed r now totally different from eachother and can not interbreed ...Could someone please explain allopatric speciation? And polyploidy in wheat? They both really confuse me! :/
allopatric speciation is the geographic speciation of organism where they r totally separated from eachother due to some physical barrier formation b/w the population...so the two population formed r now totally different from eachother and can not interbreed ...
polypoloidy....im not explaining the whole process but its like wen the whole set of chromosomes move to 1 side of the cell during meioses...so 1 daughter cell die due to luck of chromosome but the otherdaughter cell gets the full set of chromosome forming poluypliody... hope this explaination helps u...
polyploidy is sympatric speciation. In which number of sets of chromosomes is odd and thus that specie can not make gametes and is infertile. so,it is sexually isolatedOops, I was meant to say sympatric speciation. Thanks for the polyploidy explanation! ^_^
so in sympatric speciation new species may arise due to polyploidy....Oops, I was meant to say sympatric speciation. Thanks for the polyploidy explanation! ^_^
well its not necessary that number of chromosomes is ODD.....and the polyploid organism may well be fertile......bt due to a different chromosome number compared to originl one....it cnt produce a fertile offspringpolyploidy is sympatric speciation. In which number of sets of chromosomes is odd and thus that specie can not make gametes and is infertile. so,it is sexually isolated
if one specie has odd numbers of chromosomes it can only be fertile if by chance all the chromosomes go into one cell while meiosis,and other cell remains empty. and yes there is probability of even chromosomes too in polyploidywell its not necessary that number of chromosomes is ODD.....and the polyploid organism may well be fertile......bt due to a different chromosome number compared to originl one....it cnt produce a fertile offspring
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