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Practice with Punnett Squares

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Wet Ear Wax vs. Dry Ear WaxAlthough it is nearly absent in Asian populations, wet, sticky earwax is dominant over dry, flaky ear wax.Let E = wet ear waxLet e = dry ear waxSome American servicemen who fought in Vietnam fatheredchildren <strong>with</strong> Vietnamese women during the war. Cross a father<strong>with</strong> wet ear wax (assume he is EE) <strong>with</strong> a woman that had dry earwax (ee).19. What are the percent odds that the baby will have wet earwax? ___________Wet ear wax is associated <strong>with</strong> a specific type of body odor and, moreseriously, seems to be linked to an increased risk for a specific type ofbreast cancer. This type of breast cancer was not known in nativeVietnamese before the war, but has been on the rise in generationsborn after the Vietnam War. Scientists are working on a screening testthat looks at the ear wax and body odor of women as an indicator oftheir chances of developing this type of cancer.20. Could a Vietnamese boy <strong>with</strong> an American father pass onthe allele for wet ear wax (and perhaps breast cancer) to hisdaughters? ___________________

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