Exam2StudyQues_ver 2

Exam2StudyQues_ver 2 - 1. In mitosis how are chromosomes...

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1. In mitosis how are chromosomes arranged during metaphase, and what takes place immediately after metaphase (don’t just name the phase; instead, describe specifically what happens)? Does an equivalent process take place at some point during meiosis? If so, when during meiosis does this occur? What happens and when? What is different about the “ploidy” of the cells undergoing this process in mitosis and meiosis? 2. Does crossing over occur during mitosis? If so, when? If not, explain why not. 3. What is the difference between diploid and haploid? What cells in the body are diploid and which are haploid? What kind of diploid cells can become haploid cells? 4. How does crossing over lead to greater genetic variation between individuals within a population? What other mechanism(s) (in meiosis ) produce genetic variation? How does fertilization affect genetic variation in the absence of crossing over? 5. Is self-fertilization likely to result in offspring that are genetically identical to the parent? to each other? Explain why or why not. 6. At what point during meiosis are haploid daughter cells first produced? How many are there? Are the chromosomes in these daughter cells surrounded by a nuclear membrane? Are these daughter cells gametes? How many daughter cells are produced by the entire process of meiosis (i.e., beginning with a single pre-meiotic germ cell how many daughter cells will there be at the end of meiosis II)? Are these daughter cells diploid or haploid? 7. The diploid number of chromosomes in a human somatic cell is 46 (2n=46). In a human somatic (body) cell prepared to undergo mitosis, how many replicated (X-shaped) chromosomes are present? How many individual DNA molecules are present? After mitosis is complete, how many chromosomes are present in the daughter cells? How many DNA molecules? 8. In human germ cells prepared to undergo meiosis, how many replicated chromosomes are present? How many individual DNA molecules are present? After meiosis I is complete, how many replicated chromosomes are present in the daughter cells? How many DNA molecules? After meiosis II is complete, how many chromosomes are present in the daughter cells? How many DNA molecules? 9.
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Exam2StudyQues_ver 2 - 1. In mitosis how are chromosomes...

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