How many tetrads are present in a single elephant cell (2n=56) during metaphase I of meiosis?
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 tetrads? 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 tetrads.
· What type of thinking is required?
o You are being asked to apply your knowledge of tetrads to calculate how many will be present in a cell during metaphase I of meiosis.
· What key words does the question contain and what do they mean?
o A Number of tetrad in a cell with 2n=56.
Gather Content
· What do you know about tetrads? How does it relate to the question?
o Tetrads form during metaphase I of meiosis when homologous chromosomes pair up. They are called tetrads because they contain four strands of DNA, two sister chromatids for each chromosome.
Consider Possibilities
· What other information is related to the question? Which information is most useful?
o If a cell is diploid, it has pairs of chromosomes equal to half the number of chromosomes in the diploid cell.
Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o If a cell has a 2n=56 then it has 28 pairs of chromosomes. During metaphase I of meiosis these pairs form tetrads. Thus, if there are 28 pairs of chromosomes there will be 28 tetrads.
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 apply your understanding of tetrads to calculate the number in a cell during metaphase I of 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 tetrads are formed from pairs of homologous chromosomes? Did you realize that if a diploid cell had 56 chromosomes that it would have 28 pairs? Did you think that each chromosome would form a tetrad by itself? Did you think that a tetrad contained four chromosomes?
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