Genetic And Non Genetic Mechanisms Of Inheritance Essay

2222 WordsOct 19, 20169 Pages
Regina Noel 10/19/2016 Epigenetics: Genetic and Non-Genetic Mechanisms of Inheritance When discussing the topic of genetics, it is typically viewed from the perspective of Mendelian inheritance in which genes are transmitted from parent to offspring solely through the use of genetic alleles, which are the alternative form of genes that have varying DNA sequences and chromosomes that affect the phenotype, visual gene trait (Toth. 2015). If and how a genetic trait is expressed is whether the alleles for that trait are dominant or recessive. Dominant alleles are genes that have a higher probability of being expressed in the offspring than a recessive allele. In the case of dominate alleles; there are two possible combinations that its gene can still be expressed with, homozygous (which contains two dominant alleles) and heterozygous (which contains a dominant and recessive allele). On the other hand, recessive alleles can only be expressive if it is homozygous (which contains two recessive alleles) (Reece et al. 2013). Since Gregor Mendel’s discovery of alleles and genetic inheritance, there has been research shows that there are more mechanisms of inheriting traits which do not include changing the nucleotide sequence of DNA. This form of non-genetic inheritance is called epigenetic modification. One example of epigenetic modification is DNA methylation. DNA methylation is when methyl groups, which are chemical groups that contain one carbon bound to three hydrogen atoms,
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