3. Answer Key Practice Questions Review Mitosis & Meiosis

3. Answer Key Practice Questions Review Mitosis & Meiosis

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MEIOSIS & MITOSIS 1. Compare the daughter cells that result from mitosis and meiosis. Daughter cells of mitosis are genetically identical to each other & the parent (precursor) cell; 2 daughter cells result. Daughter cells of meiosis are genetically unique from each other & the parent cell; they have ½ the number of chromosomes as parent cell (in form of 1 homologue from each homologous pair); typically 4 daughter cells result. 2. A cell has undergone meiosis. A) Can it undergo another meiotic division? Why or why not? B) What about a mitotic division? Why or why not? a) No, during meiosis there is a halving of chromosomal material. Because a cell that has undergone meiosis in an individual now contains just half the amount (for a diploid indiv), it no longer divides meiotically. b) Yes, mitosis following meiosis can occur, because it makes genetically identical daughter cells& happens in some organisms ( e.g., Neurospora crassa ). 3. What is fertilization? Production of offspring through fusion of gametes or spores. 4. A complete set of chromosomes in an organism’s cell is followed by separation of the duplicated chromosomes into two new cells. What is this process called? Mitosis 5. Are plants that reproduce through self-fertilization considered to be asexual or sexual? Explain. Sexual. Fertilization is fusion of gametes or spores, both of which are formed via meiosis. 6. After cell division is complete, chromosomes are no longer visible using regular microscopes. Why is this so? The chromatin is decondensed at this point and is more filamentous in nature. 7. What are the products of meiosis? Gametes in animals; spores in plants/fungi. 8. Describe what happens to the products of meiosis if nondisjunction occurs during Meiosis I. 2 types of gametes result in equal frequency: those with n +1 (haploid number plus 1) and those with n -1 (haploid number minus 1). 9. Describe what happens to the products of meiosis if nondisjunction occurs during Meiosis II. 3 types of gametes result: n +1, n -1 (both are present in frequencies of ~ 25%), and n (normal haploid number; 50% of gametes). 10. a)Assuming you are “normal” (i.e., no chromosomal number abnormalities) you inherited more chromosomes from your mother than your father. True / False b) Explain your answer for part a). You receive 23 chromosomes (22 autosomes plus sex chromosome) from both. 11. Organisms that reproduce asexually usually do so through the process (or one quite similar to) of _ mitosis _. 12. Meiosis is called a reduction division, but all of the reduction occurs during meiosis I—no reduction occurs during meiosis II. Explain why meiosis I is a reduction division, but meiosis II is not. Meiosis I is reductional because the number of chromosomes is halved at this point.
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3. Answer Key Practice Questions Review Mitosis & Meiosis

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