Question

DESCRIBE THE FOLLOWING IN 1 OR 2 SENTENCES
1) LAMBRUSH CHROMOSOMES
2)POLYTENE CHROMOSOMES
3)BALBIANI RING

Answer 1

Explanation:

1) Lampbrush chromosome (immature eggs) of most animals, except mammals. They were first described by Walther Flemming in 1882. Lampbrush chromosomes of tailed and tailless amphibians, birds and insects are described best of all.

2) Polytene chromosomes are large chromosomes which have thousands of DNA strands. They provide a high level of function in certain tissues such as salivary glands.

3) Balbiani rings are exceptionally large puffs on the polytene chromosomes in the dipteran Chironomus tentans. These puffs are particularly well suited for studies of the structure of active genes and the synthesis and transport of specific RNA-protein (RNP) particles.

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Answer 2

Answer:

1. lambeush chromosomes -These are also giant chromosomes but relatively smaller than lampbrush chromosomes, found in the larvae of certain dipterans

1. polytene chromosomes- Polytene chromosomes are formed by the repeated replication of homologous chromosomes, in which the replicated individual sister chromatid strands do not separate. Polytene chromosomes have approximately 1000 identical DNA molecules, which are all perfectly aligned laterally within the structure

3. balbini ring- Balbiani rings are exceptionally large puffs on the polytene chromosomes in the dipteran Chironomus tentans. These puffs are particularly well suited for studies of the structure of active genes and the synthesis and transport of specific RNA-protein (RNP) particles