T. H. Morgan summarized the basic knowledge about custody into three laws:
- Genes are always stored on chromosome linearly.
- The genes of one chromosome form a linkage group. The number of binding groups of an organism is the same as the number of pairs of homologous chromosomes of the respective organism.
- Gene exchange can take place between the genes of a homologous pair of chromosomes through crossing-over. The frequency of crossing-over is proportional to the distance of the genes.
These laws form the so-called chromosome theory of heredity.
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- OTOVÁ, Berta, et al. Lékařská biologie a genetika I. díl. 1. edition. Karolinum, 2015. 123 pp. ISBN 978-80-246-1594-3.
- ŠTEFÁNEK, Jiří. Medicína, nemoci, studium na 1. LF UK [online]. [cit. 2010-02-11]. <https://www.stefajir.cz/>.