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| Non-transmitted allele | |||
| Transmitted allele | M1 | M2 | Total |
| M1 | a | b | a+b |
| M2 | c | d | c+d |
| Total | a+c | b+d | 2n |
The letters (a, b, c, d) represent the counts of over-transmissions of an allele from the parents to affected offsprings. The number n denotes total number of affected offsprings and 2n represents the total number of parents.
