Part 3: Short answer (?? total points for this section) Question 3.1: C. elegans

Question

Part 3: Short answer (?? total points for this section) Question 3.1: C. elegans is a diploid organism, and each C. elegans cell normally has 12 chromosomes (2n=12). For each of the following cell cycle stages, state the number of nuclear DNA molecules present in a C. elegans cell. (5 points total) Assume the transition from one cell to two cells occurs with the onset of anaphase in both mitosis and meiosis, even though cytoplasmic division occurs at a later stage. a. metaphase of mitosis. b. metaphase I of meiosis. c. telophase of mitosis. d. telophase I of meiosis. e. telophase II of meiosis

Explanation / Answer

a. Metaphase of mitosis will contain 12 chromosomes but DNA molecules will be 24 because DNA is replicated.

b. Metaphase of meiosis 1 also contain 12 chromosomes and 24 DNA molecules in the form of tetrads.

c. Telophase of mitosis will having 24 chromosomes and 24 DNA molecules because karyokinesis is in last stage and cytokinesis is yet now to be happen.

d. Telophase 1 of meiosis contain 6 chromosomes and 12 DNA molecules due to reduction of genetic material by half in anaphase 1.

e. Telophase two contain 6 chromosomes and 6 DNA molecules because sister chromatids are separated in anaphase 2.

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