Are the physical features of a Dragon species also the same in Dragonborn and Half-dragon species? Because (obviously, apart from colour) the description of a Dragonborn suggest that they are somewhat "Mongrel" in their evolution:
First generation dragonborn more strongly resembled their ancestors, especially in terms of scale colour, but generations of interbreeding have created a more unified appearance
This would suggest that because I have chosen a scale colour (other than perhaps brass, bronze, scarlet, rust, gold, or copper-green; which are suggested to be the more "common" scale colours), that my resemblance is in fact closer to the Dragon I came from.
For Half-Dragons however, because they are direct descendants of Dragons themselves; it suggests that their appearance is in fact closer to their descendants:
A dragon's magical nature allows it to breed with virtually any species. This sort of conception usually happens when a dragon has been polymorphed or had its form changed in some way.
So is it true that if I choose a scale colour when creating my Dragonborn character, that my appearance is similar to the same species of Dragon?