101-07-genetics-how traits are inherited

101-07-genetics-how traits are inherited - genetics: how...

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1 genetics: how traits are inherited inheritance Why do things look like their parents? Why do they not look exactly like their parents? Why do some traits skip generations? trait = a particular variation of a given character e.g. , red hair, smooth leaves, long tail feathers blending hypothesis = offspring look like mix of parents e.g. then offspring would be grey many exceptions: maybe get black offspring maybe get grey offspring, but what should grandchildren look like? ancient Greeks observed that traits sometimes “skip” a generation grandchildren might be black again
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2 Gregor Mendel father of genetics developed rules used to predict inheritance traits maintained after many generations studied peas easily manipulated in breeding experiments peas cross-fertilization = one flower fertilizes another
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3 P = parental generation F 1 = 1 st generation of offspring F 2 = 2 nd generation of offspring (F = filial = “son”) not blended monohybrid cross
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101-07-genetics-how traits are inherited - genetics: how...

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