1. Starting with a “parent” cell that has two homologous chromosomes as pictured below. (diploid), 2n=2 means that this diploid cell has two same-sized, homologous chromosomes. Fill in the circles below. Just draw chromosomes, no spindles or nuclear envelope. “A” and “a” represent alternate alleles of same gene. Use a vertical metaphase plate. Label each cell as haploid (1n) or diploid (2n)= number of chromosomes.
1. Starting with a “parent” cell that has two homologous chromosomes as pictured below. (diploid), 2n=2 means that this diploid cell has two same-sized, homologous chromosomes. Fill in the circles below. Just draw chromosomes, no spindles or nuclear envelope. “A” and “a” represent alternate alleles of same gene. Use a vertical metaphase plate. Label each cell as haploid (1n) or diploid (2n)= number of chromosomes.
2. There are two pairs of chromosomes in a diploid cell (2n=4). Label the genes and alleles on homologs and sister chromatids. A is on the big chromosome and B is on the smaller chromosome. The genotype is AaBb. Using a vertical metaphase plate, draw the two independent orientations of this AaBb cell in Metaphase I of MEIOSIS.
On the lines above, indicate the genes/alleles in the gametes (after cytokinesis II) that would results from that alignment in the circles above (no crossover has occurred).
3. Discuss, agree and indicate the following on this diagram. If the term or process is not shown, please cross it out.
i) diploid parents
iv) anaphase of Meiosis I vii) random fertilization
ii) haploid gametes
v) anaphase of Meiosis II viii) independent assortment
iii) mating
vi) crossover
ix) diploid offspring
4. Draw replicated chromosomes in a cell that is 2n=6 versus one that is 3n=6. (hint: first solve for 1n=_____ and draw the chromosomes in the appropriate haploid cells. Make non-homologs different sizes)
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