Biology
The principle of dominance states that

All alleles are dominant
All alleles are recessive
Some alleles are dominant, while others are recessive
Alleles are neither dominant nor recessive

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Biology
Neurospora is used as genetic material because

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

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