Question

15. The cell shown (alright) is a diploid 4) cell and it is in Gl of the cell cycle. There are 3 different genes of interest. The loci for the Aa and Bb alleles are found on a single chromosome. The loci for the Ele alleles are found on a second chromosome. II w is the peofell? 2 points Take this cell to Metaphase 1 of Meiosis by properly replicating, and drawing, the chromosomes and their alleles. For now, do not go through recombination. Draw two possible orientations of the chromosomes during Metaphase 1 (I am looking for the orientations that would produce different combinations of alleles at the end of Meiosis). You do not need to use different colored pencils pens, but you can if you want. (8 posts tal: 4 points each cell) Pick one of the cells that you drew above (it doesn't matter which one) and revise the image so that it correctly represents the cell in Metaphase 1 but after recombination has occurred. 5 points cach cell) • I don't care which cell you select... but please circle the cell that you selected so I know your starting point. I don't necessarily care where recombination occurs or if it occurs on one or two chromosomes... but it does need to occur and I want you to use the space to the right of the drawing to describe to me what occurred during recombination

Answer 1

15. The cell shown all right) is a diploid (2n-) cell and it is in Gl of the cell cycle. There are 3 different genes of interest. The loci for the Aa and Bo alleles are found on a single chromosome. The loci for the Ele alleles are found on a second chromosome What is the genope of cell? points) Take this cell to Metaphase I of Meiosis by properly replicating, and drawing, the chromosomes and their alleles. For now, do not go through recombination. Draw two possible orientations of the chromosomes during Metaphase 1 (I am looking for the orientations that would produce different combinations of alleles at the end of Meiosis. You do not need to use different colored pencils pens, but you can if you want. (8 points total: 4 points each cell) A- A AB - b Spindle fibers -b centrioles centromere Non-homologous chromosomes Homologous Pick one of the cells that you drew above (it doesn't matter which one) and revise the image s chromosomes ctly represents the cell in Metaphase 1 but after recombination has occurred. 5 points cach cell) • Ton't care which cell you select... but please circle the cell that you selected so I know your starting point. Idn't necessarily care where recombination occurs or if it occurs on one or two chromosomes... but it does need to occur and I want you to use the space to the right of the drawing to describe to me what occurred during recombination During S phase, the chromosome replicates, the duplicated pair remains connected to the chromosome via centromere. Hence the fully condensed chromosome during meosis will have 2 chromatids. During prophase1 of meiosis the recombination between the chromatids of the chromosomes occurs. Here recombination happened between the first pair of chromsomes (larger ones) and the locus for gene A got exchanged between them. Same thing happened with the smaller pair of homologous chromosomes and the locus for E got exchanged. During metaphase1 of meiosis the recombined homologous chromosomes are arraned in the metaphasic plate of the cells so that the set of non homologous chromosomes are pulled towards the opposite poles via spindle fibers attached to their centromeres. Poles of the cell