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Sex-linked traits are traits/genes that are carried on the X chromosome

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Blood Alleles are blood types but it goes into further detail to show genotype and phenotype

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A pedigree is a family tree that may show (certain) traits

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The usual treatment for Polydactyly is getting surgery to remove the extra finger - Brian G

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Being Polydactyly/ having an extra finger is usually the dominant gene but its rare that's why we don't see it too much - Brian G

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Since there is not major symptoms, the person can usally live a normal life. But the person might get made fun of because of the extra finger. Also, if they do not the finger then they would not be able to wear gloves - Jesus H

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There are really no major or minor symptoms of being polydactyly. There is no symptoms that greatly impact the person other than they have an extra finger.  - Jesus H