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Principles of Human Genetics and Inheritance
Human genetics is the study of how traits and biological information are passed from parents to offspring through deoxyribonucleic acid (DNA).
The human genome consists of approximately 20,000 to 25,000 genes located on 23 pairs of chromosomes. Inheritance patterns generally follow Mendelian principles, where traits can be dominant, recessive, or X-linked. For example, in autosomal dominant inheritance, a single copy of an altered gene from one parent is enough to cause a specific trait or condition. In contrast, autosomal recessive conditions require the offspring to inherit a mutated gene from both parents to manifest the trait.
Beyond simple inheritance, modern genetics explores complex "multifactorial" conditions where multiple genes interact with environmental factors. Genetic variations, such as single nucleotide polymorphisms (SNPs), contribute to the diversity seen in the human population and can influence a person’s susceptibility to certain diseases or their response to specific medications. Advancements in genomic sequencing have allowed…
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