Question

Describe the structure and function of lamp brush chromosome

Answer 1

Lamp brush chromosomes are present in oocytes of birds, lower vertebrae and invertebrates during the prolonged prophase of first meoitic division. Their name stems from their similarity to bottle brushes. Lampbrush chromosome of the early prophase is a bivalent,made up of two conjugating homologues. The axis of each homologus chromosome is formed by sister chromatids that are differentiated into regions of transcriptionally active and inactive chromatin. Transcription activity of LBCs is observed as a mantle of symmetrically distributed side loops along the chromosome axis. changes in transcriptional activity are reflected in changes in their morphology. Transcriptional activity of LBCs is directly connected with physiological processes of the body and shows in the morphological structure of chromosomes. The use of cytogenetic techniques and in situ hybridization have made it possible to identity unique and repeating sequences as well as DNA replication proteins in LBCs. Particularly, interesting prospects are offered by the possibility of using LBCs in studies of transcriptional activity, cytogenetic investigations of karyotype evolution and genome mapping.

Answer 2

Answer:

Explanation:

Lamp brush chromosomes are present in oocytes of birds, lower vertebrae and invertebrates during the prolonged prophase of first meoitic division.

Their name stems from their similarity to bottle brushes.

Lampbrush chromosome of the early prophase is a bivalent,made up of two conjugating homologues.

The axis of each homologus chromosome is formed by sister chromatids that are differentiated into regions of transcriptionally active and inactive chromatin.

Transcription activity of LBCs is observed as a mantle of symmetrically distributed side loops along the chromosome axis. changes in transcriptional activity are reflected in changes in their morphology.