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The salivary gland Chromosomes in the di...

The salivary gland Chromosomes in the dipteran larvae, are useful in gene mappin because

A

these are much longer in size

B

these are easy to stain

C

these are fused

D

they have endoreduplicated chromosomes

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Verified by Experts

The correct Answer is:
D
Balbiani (1881) was the first person who observed salivary gland chromosomes in the salivary glands of Chironomus larvae. These chromosomes are very useful in gene mapping because they have endoreduplicated chromosomes. These chromosomes are formed due to the process of endoduplication or endopolyploidy or endomitosis. In this process the nuclear membrene does not rupture but chromosomes become double and they do not separate from each other.
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-CELL CYCLE AND CELL DIVISION-EXERCISE
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  2. Synapsis occurs between

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  7. Which one of the following precedes re-formation of the nuclear envelo...

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  8. In the somatic cell cycle.

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  9. Crossing over that results in genetic recombination in higher organism...

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  10. Mitotic spindle is mainly composed of proteins.

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  11. Best material to study meiosis is

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  12. Which of the following occurs more than one and less than five in a ch...

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  13. If a diploid cell is treated with colchicine, then it becomes

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  14. During karyokinesis, the spindle fibres get attached to condensing chr...

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  15. Crossing over in diploid organism is responsible for

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  17. During cell division in apical meristem nuclear membrane reappears in

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  18. How many mitotic divisions are needed for a single cell to make 128cel...

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