Optional Mitosis Worksheet 2n=6 cell 1. Draw the chromosomes in a cell (2n=6) before DNA replication (in G1). 2a. The 2n=6 cell from above has the genotype a1/a2; b1/b1; c1/c3. The “a”, “b”, and “c” genes are on different chromosomes. Draw the same cell after replication (in G2) and label the alleles on the chromosomes of your cell specific locations (arrows or lines). Be sure to represent your chromosomes so that homologous pairs can be identified. 2b. Draw the 2n=6 cell at metaphase of mitosis, during anaphase, and the resulting daughter cells. Make sure the alleles are labeled in each drawing. List the alleles present (the genotype) of the daughter cells. 3. Complete this table: Cell 2n=18 Number of chromosomes Interphase G1 18 Amount of DNA per cell (picograms) 20 Mitotic prophase Mitotic metaphase Mitotic anaphase Mitotic telophase Each daughter cell 4. Human cells normally have 46 chromosomes. For each of the following stages, for one human cell, state the number of chromosomes and how many chromatids make up each chromosome, and how many DNA molecules make up each chromosome. a. chromosomes are lined up to be pulled to opposite poles (metaphase) in mitosis # of chromosomes total # chromatids in each chromosome # of DNA molecules in each chromosome/ b. chromosomes are in G1 in cells that have just completed mitosis. # of chromosomes total # chromatids in each chromosome # of DNA molecules in each chromosome/ c. chromosomes are in G2 just prior to the start of mitosis # of chromosomes total # chromatids in each chromosome # of DNA molecules in each chromosome/