Problem Set 4 ANSWER KEY 2010

Problem Set 4 ANSWER KEY 2010 - Problem Set 4 Chapters...

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Problem Set 4 BILD1 / Winter 2010 Chapters 12-15 Traver 1 The Cell Cycle / Mitosis 1) Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? 2 5 = 32 cells after 5 mitoses. 2) A chicken has 78 chromosomes in its somatic cells. How many chromosomes did the chicken inherit from each parent? How many chromosomes are in each of the chicken’s gametes? How many chromosomes will be in each somatic cell of the chicken’s offspring? How many chromosomes are in a set? 78 total chromosomes means that the chicken received 39 from each parent’s gamete. Likewise, it will also have 39 in its own gametes. 78 total chromosomes in the somatic cells of its offspring. There are 39 chromosomes in one set. 3) What is the name for the special region on a duplicated chromosome that holds the sister chromatids together? A) centrosome B) centromere C) kinetochore D) desmosome E) microtubule organizer region 4) If there are 20 chromatids in a cell, how many centromeres are there? A) 10 B) 20 C) 30 D) 40 E) 80 The questions below refer to the following terms. Each term may be used once, more than once, or not at all. A. telophase B. anaphase C. prometaphase D. metaphase E. prophase 5) Two centrosomes are arranged at opposite poles of the cell. C. prometaphase 6) Centrioles begin to move apart in animal cells. E. prophase 7) This is the longest of the mitotic stages. D. metaphase 8) Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell. B. anaphase
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Problem Set 4 BILD1 / Winter 2010 Chapters 12-15 Traver 2 The top circle in figure below shows a diploid nucleus with four chromosomes. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is symbolized as black and the other haploid set is gray. The chromosomes in the top circle have not yet replicated. Choose the correct chromosomal conditions for the following stages. 9) at prometaphase of mitosis B. 10) one daughter nucleus at telophase of mitosis E. 11) Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, taxol must affect: A) the fibers of the mitotic spindle. B) anaphase. C) formation of the centrioles. D) chromatid assembly. E) the S phase of the cell cycle.
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This note was uploaded on 03/31/2010 for the course BIOLOGY BILD 1 taught by Professor Traver during the Winter '10 term at UCSD.

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Problem Set 4 ANSWER KEY 2010 - Problem Set 4 Chapters...

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