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Transcript
Section 6-1 Human Inheritance Patterns of Human Inheritance • Traits controlled by single genes with only two alleles – Height in pea plants – Widow’s peak – Stuff from last unit • Multiple Alleles – Some traits controlled by a single gene with more than two alleles • Blood type – controlled by three alleles – Type A – IAIA or IAi – Type B – IBIB or IBi – Type AB - IAIB – Type O - ii • Traits controlled by many genes – At least four genes are responsible for height in people – Skin color is controlled by three genes • Each gene is controlled by two alleles • Therefore almost endless combinations Sex Linked Traits • Male or Female – XX = Female – XY = Male • Sex Linked Genes – Located on the X and Y chromosomes – Males more likely to have recessive sex linked traits
