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BIOL 151 Homework 5

1.     Draw out the process of mitosis by hand,


a.     The 7 phases from your lecture notes - label each phase

                                                             i.     Interphase

                                                            ii.     Prophase

                                                          iii.     Prometaphase

                                                          iv.     Metaphase

                                                            v.     Anaphase

                                                          vi.     Telophase

                                                        vii.     Cytokinesis

b.     Three sets of homologous chromosomes (recommend making them 3 different lengths, with two different colors to represent one from mom and one from dad)

c.      The centrosomes, nuclear envelope, mitotic spindle where appropriate

d.     A one-sentence description by each drawn phase to explain IN YOUR OWN WORDS what is happening.

**Submissions to this first homework question must be drawn by hand, on paper, by computer or another medium. You can either scan your answer and upload it, or take a clear picture of it with a camera or phone camera, and submit that. If you are unsure about any of these directions, please be sure you have watched the lecture video for this chapter before completing the homework.


2.     Mitosis and Meiosis have several structural similarities, but the processes are fundamentally different. By each of these steps of meiosis, write (briefly) what happens in the cells. [You may also want to draw this process for your studying purposes, but this is not required.]

a.     Interphase


b.     Prophase 1



c.      Prometaphase 1


d.     Metaphase 1


e.     Anaphase 1


f.       Telophase 1


g.      Cytokinesis


h.     Prophase 2



i.       Prometaphase 2


j.       Metaphase 2


k.      Anaphase 2


l.       Telophase 2 & Cytokinesis


3.     Draw a simple diagram of the cell cycle. Include:

a.     Labels of each of the 4 main stages

b.     A brief description of what happens in each stage, in your own words.

**The same guidelines as above apply to submitting the required drawn answers for this homework question.









4.     Fill in the following table comparing homologous chromosomes and sister chromatids (You might want to use words like "same" or "different" in each box). This may either be typed, or handwritten and scanned/photographed.


Sister Chromatids

Homologous Chromosomes






Centromere placement





DNA sequence





Gene content






5.     A human somatic cell contains 46 chromosomes, 2 homologues of each of the 23 different chromosomes. Gametes (sperm or eggs) in a human contain only 23 chromosomes (one of each of the 23 chromosomes). Thus, we consider the diploid number for humans to be 46, and the haploid number to be 23. Based on this information, answer the following questions.

a.     If an organism has 14 chromosomes in its gametes, how many chromosomes would it have in a somatic cell?

b.     How many copies of each gene are present in a diploid cell?

c.      During interphase, chromosomes are replicated. How many copies of each gene are present in a cell during prophase of mitosis?

d.     How many copies of each gene are present in a daughter cell after mitosis?

e.     How many copies of each gene are present in a daughter cell after meiosis?

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