Genetics: Chromosomes, Meiosis and Mitosis, and Inheritance Patterns
MCAT Basics (from MedSchoolCoach)
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Genetic Leakage and Penetrance
Genetic leakage is the flow of genes from one species to another that can create hybrid species. In genetics penetrance is the proportion of individuals carrying a particular allele of a gene that also express the phenotype. For instance inherited breast cancer can come in the form of mutations to the brocco one gene and so females with a mutation have an 80 percent lifetime risk of developing cancer.
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