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how can you test a food to find out if it con how can you test a food to find out if it con how can you test a food to find out if it con IR. Largs, multi Endomitois C Stay inside mitochondria D. Can be found in endoplasmic neticulene p in pari 33. Up to how many copies polyiene chrom replicate? A. 200 copics ?. 1 million C. 20 copies D. None of the above 9.What is the rcu of the parallel alignt in potysne chromosomec ?.Utaqu. oomplex panem ofughn und dark bands B. Make cells C. Make cells dead D. Seops cell division 4 What is the molecular basis of polysne chromosomes A. The chromosomes are replicated in high number withou R. They are 23 pairs C. They divide hy meiosi D. None of the above 40. From where did we exaract tdese giant chromosone A. In auclei of salivary glands, 3t stage of larvae B. From adult Drosophila C. From maize D. From peas 35. Which kind of larvae should be selected to isolate polytene chromosomes? A A large third instar larvase just ready bo pupate B. Larvac from dead fly B. Larvae from Fl generation D. Larvae from F2 gencration 6. Who first discovered polytene chromosomes? A. Balbiani in 1881 in salivary glands of chironomus B. Thomas Morgan in 1881 C Gregor Mendel in 18881 D. None of the above 37, What do dark bands and interbands reflect in polytene A. Reflects chromatin and DNA concentration respectively B. Reflects chromosomes and nucleus respectively C. Reflects mitochondria and endoplasmic reticulum respectively D. Nooc of the aboveExplanation / Answer
Polytene chromosomes are large chromosomes due to multiple rounds of DNA replication without cell division .Each chromosome can replicate upto nine times so they may contain upto 1024 copies of DNA .
As mentioned above the molecular basis of polytene chromosomes is that the chromosomes are replicated in high number without cell division.
A large third instar lava just ready to pupate is ideal for incubation of polytene chromosomes.
They were discovered in 1881 by Balbiani in salivary gland of chironomus.
The polytenes have dark bands and lighter areas called interrbands between them . The dark bands indicate 95% of DNA in them whereas the rest 5% is in the interband s.chromatin is also seen as a dark band .
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