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Transcript
Blood Typing 11.5 Linkage Groups • The farther apart two genes are on a chromosome, the more often crossing over occurs between them • Linkage group – All genes on one chromosome – Linked genes are very close together; crossing over rarely occurs between them Linkage and Crossing Over The Distance Between Genes • The probability that a crossover event will separate alleles of two genes is proportional to the distance between those genes Epistasis • Epistasis – Two or more gene products influence a trait – Typically, one gene product suppresses the effect of another • Example: Coat color in dogs – Alleles B and b designate colors (black or brown) – Two recessive alleles ee suppress color Epistasis in Coat Colors
