However, Mendel's laws stop short of explaining some patterns of genetic inheritance. These practices are the result of rules governing inheritance and property ownership. For Muslims, these tribunals deal with questions of marriage, divorce, custody, and inheritance and wills. It also affirms family life by legislating on matters of marriage, divorce, and inheritance. Dominance is a key concept in Mendelian inheritance and classical genetics. DNA methylation is another mechanism studied for transgenerational epigenetic inheritance. Anticipation tends to be less severe than in cases of maternal inheritance. Population genetics began as a reconciliation of Mendelian inheritance and biostatistics models. Genomic imprinting is an inheritance process independent of the classical Mendelian inheritance. All died childless, leaving Charles with a rich inheritance of titles. The practices of "marriage by inheritance" was forbidden. The Flavors object system introduced the concept of multiple inheritance and the mixin. Gladstone defended primogeniture, unlimited inheritance, and the British Aristocracy. Advances in understanding genes and inheritance continued throughout the 20th century. There was change in the inheritance law.