The Roache DNA Project which includes all variant spellings, is for people who are interested in exploring their family history. Since this surname came into existence, diverse spellings have evolved (Roche, Roach, Roache, etc). For the most part, and contrary to popular opinion, these spelling variations are of little significance. This project will enable people to explore their deep ancestry and also reveal connections between various branches of the Roche family tree.
The Y chromosome (Y-DNA) provides a powerful tool for identifying family branches as this DNA molecule, unlike other chromosomes, is passed down directly from father to son. Only males inherit the Y chromosome, therefore surname analysis can only be performed on male DNA. Females who would like to check their direct paternal line can have a male relative with the Roache surname order a Y-DNA test.
Occasionally when a Y chromosome is passed on, its genetic code undergoes a very small alteration (mutation). Most are completely harmless and so are passed on to succeeding generations. Over time, additional alterations can occur. In this way, separate male lineages become different from one another.
By comparing the Y chromosome from different Roche families, it is possible to judge how closely they are related. If their genetic codes are very similar, we can say that they share a common male ancestor in the recent past. The more differences in their genetic code, the more generations have passed since their last common ancestor.
We also have an additional website with more information; "Roche Lineages":