Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inbreeding and outbreeding depressions in the Penna model as a result of
  crossover frequency   The population in the sexual Penna ageing model is first separated into
several reproductively isolated groups. Then, after equilibration, sexual
mixing between the groups is allowed. We study the changes in the population
size due to this mixing and interpret them through a counterplay of purifying
selection and of haplotype complementarity.

9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th