 For example, the commonly used " TM3, Sb " balancer is a balancer chromosome that stabilizes the third chromosome and carries a mutant Sb ("stubble") gene as a  marker.
<coherence>  For example, the commonly used " TM3, Sb " balancer is a balancer chromosome that stabilizes the third chromosome and carries a mutant Sb ("stubble") gene as a  marker.
 For example, the commonly used " TM3, Sb " balancer is a balancer chromosome that stabilizes the third chromosome and carries a mutant Sb ("stubble") gene as a dominant marker.