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hemizygous
the condition of a gene where only one set of chromosomes from a chromosomal pair is observed.
(only in males where it is on sex linked x gene)
DNA methylation
Process by which a methyl group is added to DNA molecules, often at cytosine residues, resulting in changes in gene expression without altering the DNA sequence.
epigenetics
The study of heritable changes in gene expression without altering the DNA sequence. It involves modifications to DNA or associated proteins that can be passed on to future generations.
histones
a protein that provides structural support for a chromosome. Each chromosome contains a long molecule of DNA, which must fit into the cell nucleus. To do that, the DNA wraps around complexes of histone proteins, giving the chromosome a more compact shape.
heterozygous
having different alleles for a particular trait.
homozygous
having the same alleles for a particular trait.
genotype
the genetic makeup of an organism
phenotype
an individual's observable traits
Note
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