Detached ear lobe allele is dominant over attached ear lobe allele
Step-by-step explanation:
Mendel is the one who found the reason why an offspring has characteristics of the parent. He found that some traits were exhibited in an individual while the others were not. So he named the expressive allele as dominant trait and the one which in not expressive as recessive trait.
He formulated a set of hypothesis and experimented it on the pea plant to form the “Law of Inheritance”. In humans the detached ear lobe, blood groups all are examples of the law of dominance. Hence Mendelian traits are the physical characters that are passed on from one generation to the other .