What is an allele? And how is a dominant trait is identified for example between tall and dwarf the dominant trait is tallness thats ok but how the dominant trait is identified please answer this briefly

What is an allele? And how is a dominant trait is identified for examp

1.	What is an allele? And how is a dominant trait is identified for example between tall and dwarf the dominant trait is tallness thats ok but how the dominant trait is identified please answer this briefly
Answer» What is an allele? And how is a dominant trait is identified for example between tall and dwarf the dominant trait is tallness thats ok but how the dominant trait is identified please answer this briefly