Inheritance within the Class pattern can very simply be achieved by using the class ... extends syntax like so:

class Animal {}
class Tiger extends Animal {}

This will ensure that any instance of Tiger will have [[Prototype]], which itself has [[Prototype]] of Animal.prototype:

Object.getPrototypeOf(new Tiger()) === Tiger.prototype;
Object.getPrototypeOf(Tiger.prototype) === Animal.prototype;

Here, we have confirmed that each new instance of Tiger has [[Prototype]] of Tiger.prototype and that Tiger.prototype inherits from Animal.prototype.