Dr. Johnson Varkey taught Biology at the St. Philip's College in San Antonio until January of this year when he was fired after students complained about him 

Four students are said to have complained about a class last November when he described how X and Y chromosomes determine sex in humans 

Varkey, a devout Christian, was also accused of injecting his classrooms with religious teachings - which he strenuously denies

A Texas professor who also works as a Pastor has been fired after teaching students that sex in humans is determined by X and Y chromosomes. 

Dr. Johnson Varkey was fired from his role at St. Philip's College in San Antonio in January of this year after teaching at the facility for 20 years. 

He was sacked after four students walked out of his class last November in protest over his teaching that X and Y chromosomes determine sex in humans.