Biology
A genus can best be defined as

A taxon composed of families
A taxon composed of one or more species and a classification level lying below family
A taxon comprised of classes
The most specific taxon

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Biology
Neurospora is used as genetic material because

the product of single meiosis can be easily analysed
is a diploid fungus
meiotic products are linearly arranged in the form of ordered tetrads
it has short life cycle of 10 days

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