When looking at a stained cell under a high power light microscope, can one distinguish between the inactive X-chromosome and the active one? If so, how? If not, why not
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When looking at a stained cell under a high power light microscope, can one distinguish between
the inactive X-chromosome and the active one? If so, how? If not, why not?
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- Why is it difficult to observe individual chromosomes during interphase?.Eukaryotic cells must sort their chromosomes during mitosis sothat each daughter cell receives the correct number of chromosomes. Why don’t bacteria need to sort their chromosomes?Chromosome study requires visualization of metaphase chromosomes, how do we achieve this?
- With regard to thickness and length, what do you think chromosomes would look like if you microscopically examined them during interphase? How would that compare with their appearanceduring metaphase?A cell from a human female has just undergone mitosis. For unknown reasons, the centromere of chromosome 7 failed to divide. Describe the chromosomal contents of the daughter cells.A colleague e-mails you saying that she has identified an interesting chromosome variation at 21q13. In discussing this discovery with a friend who is not a cytogeneticist, explain how you would describe this location, defining each term in the chromosome address 21q13.
- Diploid onion cells have 16 chromosomes each. After a diploid onion cell does mitosis and cytokinesis, how many chromosomes should each daughter cell have?In meiosis, each centromere has a spindle fiber attached only to one side. In mitosis, each centromere has a spindle attached to how many sides?A female fruit fly has one normal X chromosome and one X chromosomewith a deletion. The deletion occurred in the middle ofthe X chromosome and removed about 10% of the entire length ofthe X chromosome. Suppose you stained and observed the chromosomesin salivary gland cells of this female fruit fly. Draw thepolytene arm of the X chromosome. Explain your drawing.
- You are given a metaphase chromosome preparation (a slide)from an unknown organism that contains 12 chromosomes.Two that are clearly smaller than the rest appear identical inlength and centromere placement. Describe all that you canabout these chromosomes.What is a mitotic chromosome?it is a region of condensed pinched chromosomes?