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Using the lytic bacteriophage P22 you perform a three-factor cross in Salmonella typhimurium. The phage is initially grown on an Arg+ Leu+ His+ strain of S. typhimurium. The progeny phages are then infected into a recipient bacterium which is Arg- Leu- His-. You select 1000 Arg+ recipients and test them […]

Cellular reproduction in Eukaryotes involves either mitosis or, in the case of sex cells, meiosis. Mitosis involves the reproduction of a cell into two identical daughter cells. Meiosis, however, is a reduction division where a parental diploid cell produces four haploid gametes. Upon fusion, two haploid gametes (in humans the […]

1. Bacteriophage M13 infects E. coli differently from the way bacteriophage T2 does. The M13 coat is removed in the inner membrane of the bacterial cell, where it is sequestered during phage replication. It is subsequently used to package the newly replicated phage DNA to create progeny phage. Why would […]

Q1. Suppose that the allele controlling brown eyes (B) is dominant over those controlling blue eyes (b) in human beings. (In actuality, eye colour in humans is an example of multigene inheritance, which is much more complex than this.) A blue-eyed man marries a brown-eyed woman; and they have six […]