Hello again erix, here are the first 4 colums (sid, genotype, gender and tgroup, together with the first 19 rows of data. Thanks for helping me.

sid    genotype    gender    tgroup
1    c    female    3
2    b    male    3
3    c    male    3
4    b    male    1
5    c    female    3
6    b    male    1
7    a    female    2
8    a    male    3
9    d    male    1
10    a    female    2
11    d    male    2
12    d    female    2
13    d    male    2
14    d    female    1
15    d    female    4
16    d    female    2
17    d    male    3
18    c    male    1
19    a    male    1
[download]