Crossing over occurs at the four-strand stage when two homologous chromosomes, each consisting of a pair of sister chromatids, are paired. Each crossover involves just two of the four strands and generates two recombinant strands.
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Sorry, I'm confused there has to be more to it if there is not then there is no true way for anyone to fill in the blanks. <3
The use of alcohol by the operator can have an effect in operational safety of the vessel and that would include the crew as well as the passengers. Hope this is the right answer and would be of big help.
