Task 2 LET\'S MAKE GAMETES! Simulate a diploid cell with 4 chromosomes going thr

Question

Task 2 LET'S MAKE GAMETES! Simulate a diploid cell with 4 chromosomes going through Meiosis 1. Using the chromosome model kit, obtain 4 chromosomes. If any sister chromatids are attached separate them from one another. If there are any plastic buttons inserted into the chromosomes selected from the kit remove them from the model chromosomes. Note: The cirele printout that you wll be using throughout this exercise does not represent the entire cell it only represents the cell's nucleus. Select two homologous,pre Synthesis (pre"S" phase) chromosome pairs Make sure each homologous pair is exactly alike including the connectors. 9. Why would making sure that each homologous pair are exactly the same be important to this model? 3. Select a unique shaped sticker for each pre-S homologous pair. Make each a different color Why is it important for each plastic button to be a different color in this model? 10. 7-6 104/ EXERCISE 7

Explanation / Answer

9.Homologous pairs are choosen here because they have same size and have centromeres in the same place and their loci code for same proteins,expressing same type of gene and this makes the studyrelevant and easy.

10.different coloured plastic buttons used because after completion of meiosis the diploid (2n)chromosomes converted to haploid(n) chromosome and by marking it is easy for us to differentiate changes in each homologous pair

11.Between pre-synthesis phase and synthesis phase only the DNA replication takes place . But the no. of chromosomes remains same . In this stage Nucleus is not in a state of division .

12.As the DNA starts replication its amount gets doubled than earlier

13.Only the DNA (genetic material) present in the chromosomes double but no changes takes place in the no. Of chromosome because it is just a initiating stage for celldivision and the chromosomal no. Changes during cell division

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