If a germ-line cell from an owl contains 8 picograms of DNA during G1 of interphase, how many picograms of DNA would be present in each cell during prophase I of meiosis? (Enter the number only, not the units.)
What will be an ideal response?
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you know about meiosis? How does it relate to the question?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
·Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
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Clarify Question
· What is the key concept addressed by the question?
o The question asks about the amount of DNA in a cell at different stages of meiosis.
· What type of thinking is required?
o You are being asked to analyze the amount of DNA present at different stages of meiosis.
· What key words does the question contain and what do they mean?
o 8 picograms of DNA in G1 – after S phase the cell will have 16 picograms of DNA. During prophase I the cell will not have segregated any chromosomes yet.
Gather Content
· What do you know about meiosis? How does it relate to the question?
o After G1 a cell enters S phase where the chromosomes replicate. The chromosomes then condense in prophase I but do not divide until anaphase of meiosis.
Consider Possibilities
· What other information is related to the question? Which information is most useful?
o The chromosomes replicate but do not divide, so the cells will have twice the mass of DNA as in G1.
Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o Because the DNA has duplicated, but not divided again, the cells will have twice as much DNA. So, if they had 8 picograms to start with they will now have 16 picograms.
Reflect on Process
·Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to calculate the amount of DNA in a cell at a specific stage in meiosis. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you recall that after G1 the cells will duplicate their DNA? Did you realize that the cells in prophase I will not have divided their DNA yet?
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What will be an ideal response?