Cell Cycle and Cell DivisionMedium
Question
In salivary gland chromosomes / polytene chromosomes pairing is
Options
A.absent
B.occasional
C.formed between non-homologous chromosomes
D.formed between homologous chromosomes
Solution
polytene chromosomes / salivary gland chromosomes was reported by Balbiani (1881) form cells of salivary glands of Chironomus larva (insect of Diptera group). The polytene chromo somes becom giant due to endoduplicaton , ir, repeated replication of chromatids without their separation and cytokinesis. In fact, each polytene chromosome is formecd by pairing of two somatic homologous chromosome which undergo repeated endomitosis to form numerous strands attached to a common large chromocentre.
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