Glands 82 Polytene Chromosomes from Drosophila Salivary FIGURE 7.3 Low- and high

Question

Glands 82 Polytene Chromosomes from Drosophila Salivary FIGURE 7.3 Low- and high-magnification photographas of a typical student slide of D. cirills polytene chromosomes. Acet orcein stain. Notice the unique banding pattern of each of the distinct chromosomes Photographs by RLH a. Can you detect the banding pattern? b. Can you see a nucleolus? c. If you follow the Drosopbila chromosomes, can you observe their convergence in a central location? Such a convergence of the centromeric regions of these chromosomes is termed chromocenter d. Can you determine the chromosome number for D. virilis from the slide preparations you have made? Would you expect the salivary gland cells to possess the monoploid or the diploid number chromosomes for this species? Why?

Explanation / Answer

A. Yes
B. Yes
C. Yes Polytene chromosomes are fused at their centromeres to form the chromocenter .
D. 12 chromosome
Diploid
The germ cells are monoploid and has 6 chromosome.

e. pairing of two homologous chromosomes that occurs during meiosis.
In germ cell, sperm and egg
Polytene chromosomes are produced by repeated replication during synapsis without separation into daughter nuclei.

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