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Freediving is an activity in which a person dives, sometimes to great depth, without the use of scuba gear. The diver must hold his or her breath for the duration of the dive. (The record depth, with no equipment such as diving fins, is 101 m; the official record time […]

Mrs. Ryan, a middle-aged woman, appears at the clinic complaining of multiple small hemorrhagic spots in her skin and severe nosebleeds. While taking her history, the nurse notes that Mrs. Ryan works as a rubber glue applicator at a local factory. Rubber glue contains benzene, which is known to be […]

Q. A locus in mice is involved with pigment production; when parents heterozygous at this locus are mated, 3/4 of the progeny are coloured and 1/4 are albino. Another phenotype concerns coat colour; when two yellow mice are mated, 2/3 of the progeny are yellow and 1/3 are agouti. The […]

A gene encoding one of the protein involved in DNA replication has been inactivated by a mutation. In the absence of this protein, the cell can not replicate its DNA. It attempts to do it, unaware it will be for the last time. What DNA products would be generated if […]