Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: A Mendelian trait is a trait that is controlled by a single gene that has two alleles. One of these alleles is dominant and the other is recessive. Many inheritable conditions in humans are passed to offspring in a simple Mendelian fashion. Medical professionals use Mendel's laws to predict and understand the inheritance of certain traits in their patients. Also, farmers, animal breeders, and horticulturists who breed organisms can predict outcomes of crosses by understanding Mendelian inheritance and probability. Answer: mendelian trait
Output:
A trait controlled by a single gene that has two alleles is given what name, after the scientist who studied inheritance?