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Section Handout - Week 2 - with answers

Answer the reductional division of meiosis i

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Unformatted text preview: See Klug page 19) In contrast to the above chromosome, during interphase a chromosome is extended and uncoiled, forming chromatin (and it looks like a mess). 5) List the terms used to describe centromere location. What do they mean? Metacentric, Submetacentric, Acrocentric, Telocentric. See Klug page 18. You can think of the prefixes: Meta – middle (through Greek scholars will argue a little here) Sub – under (in this case “not quite in the middle”) Acro –tip Telo - end 6) Choose the best matching phrase for each of the terms listed below. karyotype chromatid centromere gene chromosome a) One of the two identical halves of a replicated chromosome b) The number and appearance of chromosomes in a eukaryotic cell c) Connection between sister chromatids d) An organized structure of DNA in a cell e) Functional region of DNA located on a chromosome Answers: b, a, c, e, d 7) During meiosis, what two processes ensure genetic variation among the gametes? Answer: The reductional division of meiosis I separates homologous chromosomes, and does so randomly. Thus the resulting cells have unique combinations of maternally and paternally derived chromosomes. Also, crossing over in prophase I causes exchange between non- sister chromatids in homologous pairs. See Klug page 25. 8) In Mimulus (monkeyflower), plant stems can be either smooth...
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