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Fareeha Olaiya Meiosis POGIL

This content explains key stages of meiosis I, including chromosome replication, homologous pairing (tetrads), diploid to haploid transition, and genetic variation.

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    Meiosis How does sexual reproduction lead to genetic variation? Why? t’clk through uutom io uukr r u u topic) i4 the origuul tdl I his is June for g n n s i l i j n d rcpjir. Scxti.illv-rcpiiHiLKing organism* hjvc j second form of cdl domain thit pn dines reproductive cdk with hdf thr number of dtnimounne II Im prut*.-' , it t i l l ' d meioch ind u i i h m n it humxn* u.j|« ircw, hccilcs, ind ill mher Kitiailv- reproducing orpjrmms would he ratty diHere nr thin they ire rochv, Model 1 - Meiosis I 1. According to Model 1, in what type of organs are the cells that enter meiosis I found? The cells are found in the sex organs 2. Considering what you already know about mitosis in cells, what event must take place during interphase before a cell proceeds to division?- DNA replication

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    3. What two structures make up a single replicated chromosome? Sister chromatids 4. In Model 1, how many replicated chromosomes does the cell contain during prophase? - 4 Read This! A l k l n ire alicrninvt form* ot ihv vjnu gene, R>r example. gene A may ccxuain rhe information tor tur color. Ont jllck “A" may mult in while fur. while the liter native allele V may remit in black fur. Homologous chromosomes are chromouimcs that tunr.iin i he same genes. although cadi efiromoMinu in the homologous pan may have different allelcv 5. At which stage in meiosis I do the pairs of homologous chromosomes come together? Late prophase IL 6. Once the chromosomes have formed a pain what are they called? Tetrads 7. At the end of meiosis L two cells have been produced. How many replicated chromosomes are in each of these cells?- 2 8. Cells with a full set of chromosomes are referred to as diploid or 2n. whereas cells with half the chromosomes are haploid or n. At which stage(s) of meiosis I are the cells diploid and at which stage(s) are they haploid? Diploid- prophase, metaphase and anaphase Haploid- telophase 9. Which of the statements below correctly describes the relationship between the cells at the end of telophase I and the original cell? a. The new cells have one copy of all of the genetic information in the original cell. b. The new cells have two copies of all of the genetic information in the original cell. c. The new cells have one copy of half of the genetic information in the original cell. d. The new cells have two copies of half of the genetic information in the original cell. 10. Considering the genetic makeup of the homologous pairs, will the cells at the end of telophase I be genetically identical to each other?- They will not be identical to each other because the homologous pairs are separated and the alleles on each homologous pair are not necessarily identical.

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    Model 2 - Meiosis 11 1 1 According to Model 2, where did each of the cells come from that started meiosis II? They came from Meiosis I 12. In meiosis L during anaphase I, which structures separated— homologous chromosomes or sister chromatids (refer to model 1 for definitions)? Homologous chromosomes separated 13. In meiosis II, during anaphase IL which structures separated— homologous chromosomes or sister chromatids (refer to model 1 for definitions)? Sister chromatids separated 14. At the end of the meiosis II are four daughter cells. Are they haploid or diploid? Explain your answer in a complete sentence. - The cells are still haploid because they each contain one chromosome from each homologous pair.

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