C. Testcross D. Polytene chromosomes of DNA replication witho ei division? e A.

Question

C. Testcross D. Polytene chromosomes of DNA replication witho ei division? e A. Mitotic cells B. Tetrad chromosome C Polytene chromosome D. Crossing over 27. Which of the following have 28. How can polytense chroemosomes be ident A. By compound microscope B. By their length and banding patern C By using fluorescent dye D. None of the above can polbytcems uls are metabolically active cells are metabolically active A. In interphase cell when B. In prophase cells C. In metaphase cells D. In anaphase cells 30. Why do polyione chromosomes appear so long A. They are paired with their homolog in somatic cell B. They stay in dead cell C. They are single pair D. They are mutaied 31. What stain/dye used in the lab exercise? A. Acetooricin B. Ethidium bromide C. Propidium iodide D. FlyNap 32. Polytene chromosomes are A. Small, single stranded

Explanation / Answer

(27)c.polytene chromosome

They are produced when repeated rounds of DNA replication without cell division forms a giant chromosome.

(28)b.by their length and banding pattern.

The polytene chromosomes contain two types of bands dark bands and interbands which appear as light and dark bands under microscopes.

(29)a.at interphase,when cells are metabolically active

This is the time when light and dark bands of the chromosomes are seen.

(30)They are paired with their homolog in somatic cell.

There are many longitudinal strands called chromonemata.

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