Q. Linkage ________ as the distance between two genes ______________

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Q. In Drosophila males there is complete linkage. What is the reason behind this?

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Q. Linkage results in __________

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Q. If you suddenly observe linkage between two genes that are present in two chromosomes, this can be due to __________________

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Q. Accurate mapping of genes can be done using _______

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Q. Recombination occurs in _________

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Q. Double crossovers can involve two, three or four strands at a time. What will be the resultant percentage of recombined genes to normal genes in between which recombination occurred, taking all three types in consideration?

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Q. You cross a p+/v+ p+/v+ male drosophila to a p-/v- p-/v- and obtain the F1 hybrid. Now you cross the F1 male with double recessive female. What will be the recombination phenotype in F2?

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Q. In animals cytological study of recombination was done by_______________

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Q. Bar is a gene often used in recombination study. Which of the following is true for the Bar gene?

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Q. Consider that recombination occurs in 2 strand stage of meiosis. If a Drosophila is heterozygous for the bar locus what will be the result of recombination?

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Q. Chiasmatype theory states recombination occurs before chiasma formation. State whether it is true or false.

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Q. How many rounds of replication in BrdU will be needed to visualize Harlequin chromosome?

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Q. If two genes are unlinked the recombination frequency will be?

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Q. Is two crossovers occur between same two strands, this will result in__________

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Q. Double cross over involving ________ strands result in 100% recombinant strands.

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Q. If a recombination event of three points crossing produces 6 DCO, 142 SCO and 352 NCO. What will be the percentage cross over between the terminal genes.

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Q. If single cross over frequency between two genes r and q and q and s in 3 point mapping is 0.6 and 0.2 respectively. What will be the expected double cross over frequency?

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Q. In an experiment you calculate the expected DCO frequency to be 0.022 but in reality you observe that only 0.012 recombination frequency. What is the phenomenon resulting in this?

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Q. Which of the following will result in parental phenotype?

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