Polytene chromosomes are giant chromosomes found in cells of the salivary glands of larval fruit flies and some other organisms. Polytene chromosomes arise when repeated rounds of replication occur without cell division, producing thousands of copies of DNA that lie side by side. Why do polytene chromosomes occur in the cells of salivary glands of larval fruit flies, but not in other tissues? Propose some possible reasons.
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
Polytene chromosomes are giant chromosomes found in cells of the
salivary glands of larval fruit flies and some other organisms. Polytene
chromosomes arise when repeated rounds of replication occur without
cell division, producing thousands of copies of DNA that lie side by
side. Why do polytene chromosomes occur in the cells of salivary
glands of larval fruit flies, but not in other tissues? Propose some
possible reasons.
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