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IMG_0002 - 7 9‘ — 9 You are studying two strands of DNA...

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Unformatted text preview: / 7: 9‘ —\/ \ , , 9 You are studying two strands of DNA. They have exactly. the me len but the first one has a very high GEE/Air T ratio of 3. 4. e secofidw strand has a more mode ate G + CIAe + T ratio of 2 3 Which of the two strands will have the st melti re and why? a\ he first strand because it contains more H ebonds ’ the second strand because it contains more H bonds C) the first strand because it contains fewer H bonds , D) the second strand because it contains fewealsl-bonds E) neither since their melting temperatures are the same 10. The following recombination frequencies were found for four genes (A, B, C and D) on the same chromosome: between genes A and B — 45%, between genes C and D — 10%, between A and D — 7%, between genes C and B — 18% between genes C and A — 17%, and between genes B , .1 ~\ and D— 28%. What was the order of the genes on the chromosome? P) , \{j \ Qt: 2x83 {KW/t) M) i. 01.37. 21/ cm l i5 C/ C / ‘3) ”T‘P‘O W {,9} V \8 /o N l a {5,9 ”150/0 11 What would happen if meiosis did not include a r®n division? Eda-'Fhesnumber of chromosomes in a species would remain the same with each {.3 generation. fit {:3 gwhe number of chromosomes in a species would double with each IA», generation. , , t/\ Mr of chromosomes in a species would halve with each generation. t’t fix D) The number of chromosomes in a species would quadruple with each ,j’ 1,, generation. "‘ ’ E) Wshrink prior to each cell division. . , . , '1} 12. When a gene has been duplicated one or more times, what are the possible things that can happen to the duplicated gene? ’ A) The duplicated gene/can accumulate favorable mutations and acquire a new /" function. a B) The duplicated gene can b lost during evolution through deletion. \/ C) The duplicated gene ca e rendered nonfunctional by unfavorable mutations. D) If there are two copies of the gene, both could undergo mutation so that each evolves a more specialized function than the original gene. BAH of these are correct. ...
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