isogenous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having the same or similar origin, as organs or parts derived from the same embryonic tissue.

from The Century Dictionary.

• Of the same or a similar origin; homologous, in a broad sense, as formed from the same or corresponding tissues of the embryo.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective biology Having the same (or similar) origin