What did I receive from my ancestors?
To keep everything in perspective, the following chart shows the chance of inheriting
at least one or perhaps more chromosomes from a given ancestor. Although it is possible
for chromosomes to be passed on in fractions (called “cross-over”), that
does not appreciably affect the odds shown here. However, marriages between ancestors who are cousins
will increase somewhat the odds of inheritance and will also reduce the number of
ancestors (but that is not known to be the case in the lineage shown below).
The odds shown disregard the sex of the subject (Self) person . . .
In the case of a man (“YX” sex chromosomes), the “Y” chromosome is always inherited through the direct male lineage. So in the lineage shown below, it is 100% certain that Kurt, Franz and Mark inherited their “Y” chromosomes from Ioannes Langmann, but highly unlikely that they inherited any other chromosome from Ioannes. On the other hand, they each have about a 50-50 chance of having inherited at least one other chromosome from Karl Langmann, their fourth-great grandfather.
In the case of a woman (“XX” sex chromosomes), neither “X” chromosome is inherited from the paternal grandfather, but one is inherited from the paternal grandmother, another from the mother.
Bear in mind that one’s 46 chromosomes all came from some set of ancestors in any given generation.
|Generations Back||Lineage||Number of Ancestors||Odds of Inheriting One or More Chromosomes|
|0||Self||Kurt, Franz & Mark Langmann, b. 1954, 1958 & 1963||--||--|
|1||Parent||Rudy Langmann, b. 1930||2||1.0000000, certain|
|2||Grandparent||Richard Robert Langmann, b. 1904||4||0.9999999, virtually certain|
|3||Great Grandparent||Harald Rudolf Langmann, b. 1881||8||0.9986621, almost certain|
|4||2G Grandparent||Rudolf Wilhelm Georg Bernhard Langmann, b. 1840||16||0.9536355, about 21 out of 22|
|5||3G Grandparent||Johann Friedrich Christoph Langmann, b. 1802||32||0.7733585, about 3 out of 4|
|6||4G Grandparent||Karl Ludwig Caspar Langmann, b. 1767||64||0.5181970, about even|
|7||5G Grandparent||Andreas Langmann, b. 1719||128||0.3038654, about 1 out of 3|
|8||6G Grandparent||Andreas Langmann, b. 1681||256||0.1650581, about 1 out of 6|
|9||7G Grandparent||Bartholomaus Langmann, b. 1648||512||0.0860868, about 1 out of 12|
|10||8G Grandparent||Bartholomaus Langmann, b. 1604||1024||0.0439698, about 1 out of 23|
|11||9G Grandparent||Joachim Langmann, b. 1560||2048||0.0222213, about 1 out of 45|
|12||10G Grandparent||Nicolaus Langmann, b.abt.1530||4096||0.0111117, about 1 out of 90|
|13||11G Grandparent||Heinrich Langmann, b.abt.1485||8192||infinitesimal|
|14||12G Grandparent||Joachim Langmann, b.abt. 1450||16384||--|
|15||13G Grandparent||Nicolaus Langmann, b.abt. 1410||32768||--|
|16||14G Grandparent||Peter Langmann, b.abt. 1360||65536||--|
|17||15G Grandparent||Heinrich Nicolaus Langmann, b. 1323||131072||--|
|18||16G Grandparent||Hans Langmann, b.abt. 1280||262144||--|
|19||17G Grandparent||Conrad Langmann, b.abt. 1240||524288||--|
|25-26 (?)||23G Grandparent||Ioannes Langmann, b.abt. 980||33554432||--|
How y-DNA is passed from generation to generation:
The table above can easily be modified by substituting another known all-male lineage from 0 to X generations.