Ad
related to: non mendelian pattern of inheritance
Search results
Results From The WOW.Com Content Network
Non-Mendelian inheritance is any pattern in which traits do not segregate in accordance with Mendel's laws. These laws describe the inheritance of traits linked to single genes on chromosomes in the nucleus. In Mendelian inheritance, each parent contributes one of two possible alleles for a trait.
Uniparental inheritance is a non-Mendelian form of inheritance that consists of the transmission of genotypes from one parental type to all progeny. That is, all the genes in offspring will originate from only the mother or only the father.
Lethal alleles may specifically refer to embryonically lethal alleles, in which the fetus will never survive to term. Such alleles are a cause of non-Mendelian patterns of inheritance, such as the observation of traits in a 2:1 ratio.
Mendel himself warned that care was needed in extrapolating his patterns to other organisms or traits. Indeed, many organisms have traits whose inheritance works differently from the principles he described; these traits are called non-Mendelian. [44] [45] For example, Mendel focused on traits whose genes have only two alleles, such as "A" and "a".
Purely Mendelian traits are a minority of all traits, since most phenotypic traits exhibit incomplete dominance, codominance, and contributions from many genes. If a trait is genetically influenced, but not well characterized by Mendelian inheritance, it is non-Mendelian.
Genomic imprinting is an inheritance process independent of the classical Mendelian inheritance. [11] It is an epigenetic process that involves DNA methylation and histone methylation without altering the genetic sequence.
A polygene is a member of a group of non-epistatic genes that interact additively to influence a phenotypic trait, thus contributing to multiple-gene inheritance (polygenic inheritance, multigenic inheritance, quantitative inheritance [1]), a type of non-Mendelian inheritance, as opposed to single-gene inheritance, which is the core notion of Mendelian inheritance.
Mitochondrial inheritance is therefore non-Mendelian, as Mendelian inheritance presumes that half the genetic material of a fertilized egg derives from each parent. This allowed the creation of mitochondrial DNA haplogroups to study population genetics.