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Evidence for microevolution by natural selection Drug-resistance Mutation 1 st , drug selects

Explore evidence like industrial melanism in moths and HbS gene in humans to understand microevolution via natural selection, with insights into genetic drift, gene flow, and future human evolution.

johnsoneric
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Evidence for microevolution by natural selection Drug-resistance Mutation 1 st , drug selects

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  1. Evidence for microevolution by natural selection • Drug-resistance • Mutation 1st, • drug selects • for it

  2. Evidence for microevolution by natural selection • industrial melanism in peppered moths • < 1850 were light • > 1850 went dark • soot coated trees • Kettlewell: dark • moths survived on dark • trees, light on light

  3. Evidence for microevolution by natural selection Dark moths survived on dark trees, light on light Now select light moths

  4. Evidence for microevolution by natural selection • HbS: human microevolution • malaria selects • Het have more kids

  5. Evidence for microevolution by natural selection • HbS: human microevolution • Freq. HbS allele correlates with malaria

  6. Other evidence for microevolution in humans? • Skin color • Dark in tropics to block UV • Light in N for vit D

  7. Other evidence for microevolution in humans? • AIDS resistance • Humans homozygous for CCR5 ∆32 are “immune” to HIV • Humans heterozygous • for CCR5 ∆32 are • resistant • Humans are evolving!

  8. Humans are evolving! Mutation? Gene flow Genetic drift Outcrossing

  9. Selection has changed • less "old disease" • less birth defects • less famine • New selection • diseases • drugs • cars • pollution • birth control • Humans in 10,000 AD will have evolved!

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