BIO_181_ Homework WK9_Ch 12-13. doc PDF

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This assignment is for Neil Adam's class. This is more specifically for chapter 12 and chapter 13 homework assignments. This is also for week 9....

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David Chico

Chapter 12:

Mitosis: For each statement, decide if the event occurs in: (A)Interphase (B) Prophase (C) Metaphase (D) Anaphase (E) Telophase ( ( ( ( ( ( ( ( ( ( (

B D B E C A A C A E C

) 1. Chromosomes first become visible as sister chromatids ) 2. Sister chromatids separate into individual chromosomes ) 3. Mitotic spindle begins to migrate toward opposite poles of the cell ) 4. Nuclear envelope begins to reform ) 5. Sister chromatids line up in the middle of the cell ) 6. DNA replicates ) 7. Cell spends to most time in this phase ) 8. Microtubules are connected to the kinetochore of the sister chromatids ) 9. Includes a growth phase ) 10. Division of 2 identical daughter cells ) 11. Centrosomes are at opposite poles of the cell

A,F,E,D,B,C 12. A shallow groove in the cell known as a(n) cleavage furrow indicates that cytokinesis has begun. 13. A drug is known to inhibit the formation of the cell plate during cytokinesis. Would this drug affect human cells? Briefly explain your answer. (CRITICAL THINKING) NO, because human cells don’t have a cell plate, only plants have a cell plate.

David Chico

1.

Please fill in the table below

Requires and egg and Sperm Requires one parent Produces Genetically identical offspring Produces genetically different offspring. 2.

Asexual Reproduction no

Sexual Reproduction yes

yes yes

no no

no

yes

Please fill in the stages of the cell cycle below and give a brief description of what happens in each step of the cell cycle.

3.

LIST the enzymes responsible for regulating cell cycle:

Cyclin-dependent kinases

David Chico

CRITICAL THINKING 4. You are observing a line of rat cells and see that they repeatedly make mistakes in the cell cycle by going through the G2 checkpoint too early. This could be due to a A. B. C. D.

problem with expression of a cyclin. misplaced MPF. defective chromosome. misfolded centromere protein.

5.

If you used a very fine glass needle to pull one chromosome away from the metaphase plate during metaphase, which checkpoint would not be passed until this was corrected? A. G1 checkpoint B. G2 checkpoint C. M checkpoint D. S checkpoint E. any checkpoint

6.

Which statement comparing cancer cells and normal somatic cells would lose points on a test? A. Cancer cells often deactivate their apoptosis systems. B. Cancer cells are not as sensitive to contact inhibition. C. The cell cycle often proceeds faster in cancer cells. D. Cancer cells are more mobile and less dependent on anchorage. E. Cancer cells have more effective DNA repair activities.

David Chico

Chapter 13 Meiosis: For each statement, decide if the event occurs in: (A) Mitosis Only (B) Meiosis Only (C) Mitosis & Meiosis ( C ) 1. Dyads are visible ( B ) 2. Tetrads are visible ( A ) 3. Product is two diploid daughter cells ( B ) 4. Product is four haploid daughter cells ( C ) 5. Involves the phases of prophase, metaphase, anaphase, & telophase ( A ) 6. Occurs throughout the body ( B ) 7. Occurs in only the ovaries and testes ( A ) 8. Provides for cell growth and repair ( B ) 9. Homologs, synapse and chiasmata are seen ( B ) 10. Daughter cells are quantitatively and qualitatively different from the mother cell ( A ) 11. Daughter cells are genetically identical to the mother cell ( C ) 12. Chromosomes are replicated before the division process begins ( B ) 13. Provides cells for replication of the species ( B ) 14. Two consecutive nuclear divisions, with no chromosome replication occurring before the second division Match the key event of meiosis with the stages listed below. I. Prophase I V. Prophase II II. Metaphase I VI. Metaphase II III. Anaphase I VII. Anaphase II IV. Telophase I VIII. Telophase II Tetrads of chromosomes are aligned at the equator of the spindle; alignment determines independent assortment. A. I B. II C. IV D. VI E. VIII 2. Match the key event of meiosis with the stages listed below. I. Prophase I V. Prophase II II. Metaphase I VI. Metaphase II III. Anaphase I VII. Anaphase II IV. Telophase I VIII. Telophase II Centromeres of sister chromatids disjoin and chromatids separate. A. II B. III C. IV

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D. V E. VII 3. Refer to the drawings of a single pair of homologous chromosomes in Figure 13.2 as they might appear during various stages of either mitosis or meiosis.

Figure 13.2 Which diagram represents anaphase I of meiosis? A. I B. II C. IV D. V E. VI

4. Based on these data, how much DNA is present in a gamete of Saccharomyces cerevisiae?

a )1 2f g b)2 4f g c )4 0f g d)4 8f g

David Chico

5. The mosquito Aedes aegypti has a karyotype of 2n = 6. Which diagram shows this?...