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Genetics PowerPoint Presentation

Genetics

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Genetics

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  1. Genetics Gregor Mendel Chapter 11

  2. Mendel • Austrian Monk • Was a local high school science teacher • Job was to grow food for the entire monastery • Became interested in how traits are passed from parents to offspring.

  3. Variations

  4. Human Genetics

  5. Principles of Inheritance • E:\Early_Principles_of_Inheritance.asf

  6. Mendel • Crossed and controlled breeding of pea plants • Used burlap sacks to control pollination of flowering pea plants • Very controlled experiment • Many generations in a short period of time

  7. Mendel’s Work • Crossed a tall pea plant with a tall pea plant, produced all tall plants. • Crossed a short pea plant with a short pea plant, produced all short plants. • Crossed a tall pea plant with a short plant, produced all tall plants. • Took seeds from the previous cross, produced 3 tall plants and one short plant

  8. Monohybrid Crosses • E:\Introduction____Classical_Genetics_and_Monohybrid_Crosses.asf

  9. Mendel’s Research • E:\Gregor_Mendel_s_Research_and_Principles.asf

  10. Mendel’s Discoveries • E:\Mendel_s_Research_and_Discoveries.asf

  11. Mendel’s Hypothesis • Traits are controlled by factors (genes) which always occur in pairs • Factors (genes) separate during the formation of sex cells (gametes). • In a pair of factors (genes) one may mask or hide the effect of the other trait.

  12. Possible Gametes

  13. Punnett Square

  14. Punnett Square

  15. Punnett Square

  16. Punnett Square

  17. Punnett Square

  18. Punnett Square

  19. Punnett Square

  20. Pea Plants

  21. Mendel’s Crosses

  22. Genetic Terms • Homozygous- two alleles that are the same, TT or tt • Heterozygous- two alleles that are opposite, Tt (hybrid) • genotype- using letters to represent traits, TT, Tt, tt. • Phenotype-a physical description of a trait, • Homozygous tall, heterozygous tall.

  23. Genetics • In pigs white coat color is dominant to black coat color. Curly tails are dominant to straight tails. • Cross a heterozygous white coat, heterozygous curly tail male with a heterozygous white coat, heterozygous curly tail female. Predict the possible results.

  24. Probability • E:\Probability.asf

  25. Mendel’s research on Pea Plants • E:\Gregor_Mendel_s_Reseach_on_Pea_Plants_and_His_Development_of_Theories_of_Inheritance.asf

  26. Dihybrid Crosses • E:\Introduction___Dihybrid_Crosses.asf

  27. Dihybrid Cross

  28. Dihybrid Cross

  29. Breeding Song Birds • E:\Breeding_White_Songbird_Canaries_Through_a_Dihybrid_Cross.asf

  30. Incomplete Dominance • E:\Incomplete_Dominance_in_Snapdragons.asf

  31. Genetics • In four ‘o’ clocks, red is incompletely dominant to white flower color. The heterozygous condition results in pink flowers. • Cross a red flower with a pink flower and predict the results. • Cross a pink flower with a pink flower and predict the results.

  32. Multiple Alleles and Co-dominance • E:\Multiple_Alleles_and_Co_Dominance_in_Human_Blood_Types.asf

  33. Incomplete dominance vs. Co- dominance • Incomplete- you get a mixture. Red and white, you get pink. • Co-dominance- both traits appear. Red and white to make roan. • A and B blood types combine to make AB.

  34. Human Alleles • E:\Possible_Combinations_of_Human_Alleles.asf

  35. Fruit Flies • E:\Research_on_the_Genetic_Make_up_of_the_Fruit_Fly_Drosophila.asf

  36. Human Sex Chromosomes

  37. Sex Linked Inhertiance • E:\Introduction___Sex_Linked_Inheritance.asf

  38. Sex Linked Inhertiance • E:\Inherited_Human_Traits_and_Patterned_Sex_Linked_Inheritance.asf

  39. Color Blindness • E:\Color_Blindness.asf

  40. Color Blindness

  41. Hemophylia • E:\Hemophylia.asf

  42. Pedigree Charts • E:\Organizing_Information_About_Sex_Linked_Inheritance_in_Pedigree_Charts.asf