Question: Can anyone give an explanation to what the correct
answer is and why its right? This was a test g…


+ 160 [1 pt] At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur? A) at the four-strand stage of meiosis, after synapsis of homologous chromosomes, and before the end of prophase l Bin S phase of meiosis C) during bivalent formation, after synapsis of homologous chromosomes, and before the end of prophase l during synapsis at the four-strand stage of meiosis 9 during synapsis in prometaphase 2. [1 pt] If complete linkage occurs, we expect A) a 9:3:3:1 ratio in the F2 B) a 1:1:1:1 ratio in the test cross C) to see only recombinant phenotypes in the F2 of the appropriate test cross D) to see only parental phenotypes in the F2 of the appropriate test cross E) to see all four types of offspring [1 pt] In Seymour Benzers studies, if he mixed two RIl phage together (co-infection studies in K12) and the resulting phage always failed to lyse K12 A) the two mutants were in the same cistron B) the two mutants complemented each other C) the two mutants were in different cistrons D) the two mutants failed to infect bacteria the two mutants represented mutations in both A and B

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Can anyone give an explanation to what the correct
answer is and why its right? This was a test given in my genetics
class and very few people finished let alone passed.

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+ 160 [1 pt] At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur? A) at the four-strand stage of meiosis, after synapsis of homologous chromosomes, and before the end of prophase l Bin S phase of meiosis C) during bivalent formation, after synapsis of homologous chromosomes, and before the end of prophase l during synapsis at the four-strand stage of meiosis 9 during synapsis in prometaphase 2. [1 pt] If complete linkage occurs, we expect A) a 9:3:3:1 ratio in the F2 B) a 1:1:1:1 ratio in the test cross C) to see only recombinant phenotypes in the F2 of the appropriate test cross D) to see only parental phenotypes in the F2 of the appropriate test cross E) to see all four types of offspring [1 pt] In Seymour Benzer's studies, if he mixed two RIl phage together (co-infection studies in K12) and the resulting phage always failed to lyse K12 A) the two mutants were in the same cistron B) the two mutants complemented each other C) the two mutants were in different cistrons D) the two mutants failed to infect bacteria the two mutants represented mutations in both A and B

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