Question

10 difference between lampbrush and polytene chromosome in table form

Answer 1

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Answer 2

Answer:

Explanation:

Lampbrush chromosomes-

These chromosomes occur in the oocytes (germ cells

in the ovary) of amphibians and in fishes, reptiles

,birds and in some insects.

• They are extremely large synapsed homologous

chromosomes,seen in the diplotene stage of

prophase-I in meiosis.

• They measure about 1500 to 2000 micrometer in

length as opposed to 15–20 μm during later stages of

meiosis.

• first discovered by Flemming in 1882.

Polytene chromosomes-

• Chromatin structure is also unusually visible in

certain insect cells. Many of the cells of the larvae of

flies grow to an enormous size through multiple cycles

of DNA synthesis without cell division. The resulting

giant cells contain as much as several thousand times

the normal DNA complement.

• In several types of secretory cells of fly larvae, all the

homologous chromosome copies are held side by side,

creating a single giant polytene chromosome.

• These chromosomes, first observed in cells of insect

salivary glands of Drosophila .

Reference: http://kcpflora.in/Study%20Material/Gaint%20chromosomes.pdf