Tongue-rolling is a human trait that follows an autosomal recessive pattern of inheritance. a girl with the tongue-rolling trait has two brothers who do not have this trait. what is true of the children's parents? one parent must be homozygous dominant and the other is either heterozygous or homozygous recessive. both parents must be homozygous dominant. one parent must be heterozygous and the other is either heterozygous or homozygous recessive. both parents must be homozygous recessive.