Help Me Understand Genetics
MedlinePlus Genetics' handbook from the National Library of Medicine, a topic a page, in reading order.
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Noncoding DNA does not provide instructions for making proteins. It is important to the control of gene activity. Learn more functions of noncoding DNA.
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Each cell is able to turn genes on and off. This process is known as gene regulation and is an important part of normal development.
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Epigenetic changes are genetic modifications that impact gene activity without changing the DNA sequence. Learn more about the process.
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Families have many factors in common, including their genes, environment, and lifestyle. These factors can give clues to disorders that run in a family.
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Reduced penetrance and variable expressivity are factors that impact the effects of particular genetic changes. Learn more about these factors.
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When certain genetic disorders are passed from one generation to the next, the signs and symptoms may become more severe. This is known as anticipation.
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Genomic imprinting and uniparental disomy are factors that influence how some genetic conditions are inherited. Learn more.
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It is possible to inherit chromosomal disorders, but most are not passed from one generation to the next. Learn more about how these disorders occur.
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Some genetic disorders are more likely to occur among people who trace their ancestry to a particular geographic area. Learn more about why this happens.
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Heritability is a measure of how well differences in people’s genes account for the differences in their traits, including eye color, height, and more.
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Each person's fingerprints are unique. Even identical twins, who have the same DNA, have different fingerprints. Learn how genetics affects your fingerprints.
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