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In genetics, a maternal effect occurs when the phenotype of an organism is determined by the genotype of its mother. [1] For example, if a mutation is maternal effect recessive, then a female homozygous for the mutation may appear phenotypically normal, however her offspring will show the mutant phenotype, even if they are heterozygous for the mutation.
Since nuclear and cytoplasmic genes usually have different modes of transmission, intragenomic conflicts between them may arise. [18] Mitochondria and chloroplasts are two examples of sets of cytoplasmic genes that commonly have exclusive maternal inheritance, similar to endosymbiont parasites in arthropods, like Wolbachia. [19]
The imprinted brain theory is a variant of the kinship theory of genomic imprinting, also known as the conflict theory of genomic imprinting. The kinship theory argues that in diploid organisms, such as humans, the maternal and paternal set of genes may have antagonistic reproductive interests since the mother and father may have antagonistic ...
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.
In psychology, genetic memory is a theorized phenomenon in which certain kinds of memories could be inherited, being present at birth in the absence of any associated sensory experience, and that such memories could be incorporated into the genome over long spans of time.
Extranuclear inheritance (also known as cytoplasmic inheritance) is a form of non-Mendelian inheritance also first discovered by Carl Correns in 1908. [9] While working with Mirabilis jalapa , Correns observed that leaf colour was dependent only on the genotype of the maternal parent.
The Trivers–Willard hypothesis has been applied to resource differences among individuals in a society as well as to resource differences among societies.Investigations in humans pose a number of practical and methodological difficulties, [6] but while a 2007 review of previous research found that empirical evidence for the hypothesis was mixed, the author noted that it received greater ...
Paternal stress is an important factor in the determination of inheritance of genes as well as maternal stress inheritance. Factors such as environment and experiences can alter the epigenetic of paternal genes as well as in sperm. Epigenetic changes to the DNA in sperm ("epigenetic tags") prior to conception can be passed to offspring.