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Genetics

Genetics. Mr. Skirbst Life Science Topic 08. Genetics. Genetics. the study of heredity. Genetics. the study of heredity Heredity is the passing of traits to offspring. Genetics. the study of heredity Heredity is the passing of traits to offspring

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Genetics

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  1. Genetics Mr. Skirbst Life Science Topic 08

  2. Genetics

  3. Genetics the study of heredity

  4. Genetics the study of heredity Heredity is the passing of traits to offspring

  5. Genetics the study of heredity Heredity is the passing of traits to offspring Traits are characteristics of an organism (ex. Hair color, eye color, skin color, etc.)

  6. GENES - units of heredity

  7. GENES - units of heredity Dominant – stronger trait “T”

  8. GENES - units of heredity Dominant – stronger trait “T” Recessive – weaker trait “t”

  9. Genetics Zygote – fertilized egg

  10. Genetics Zygote – fertilized egg Homozygous (purebred) – Contains all one trait (ex. TT or tt)

  11. Genetics Zygote – fertilized egg Heterozygous (hybrid) – Contains mixed traits (ex. Tt)

  12. Genetics Phenotype – physical appearance (ex. Hair color)

  13. Genetics Phenotype – physical appearance (ex. Hair color) Genotype – Genetic makeup (ex. Tt or TT)

  14. Probability

  15. Probability - the possibility (or likelihood) that an event will happen (ex. flipping a coin, lottery, rain, characteristics of offspring)

  16. Probability Punnett Square:

  17. Probability Punnett Square: - used to show possible gene combinations in a cross between two organisms (shows genetic probability)

  18. Probability Punnett Square: b b Cross between: *Purebred recessive & *Purebred dominant B B

  19. Probability Punnett Square: b b Cross between: *Purebred recessive & *Purebred dominant Produces: *Offspring that are all hybrids B B b B b B B b B b

  20. Probability Punnett Square: B b Cross between: *Hybrid & Hybrid B b

  21. Probability Punnett Square: B b Cross between: *Hybrid & Hybrid Produces: *Offspring possibilities 2 hybrids, 1 purebred dominant, and 1 purebred recessive B B B B b b B b b b

  22. Punnett Square • Cross a homozygous dominant with a heterozygous organism • Cross a heterozygous organism with a homozygous recessive • Cross a homozygous recessive with a homozygous dominant • Cross a homozygous recessive with a homozygous recessive

  23. Punnett Square (examples)

  24. Genetic Survey Trait Male Female Total Hair (Black) _____ _____ _____ (Brown) _____ _____ _____ (Blonde) _____ _____ _____ (Red) _____ _____ _____ Eyes (brown) _____ _____ _____ (hazel) _____ _____ _____ (blue) _____ _____ _____ Tongue(roller) _____ _____ _____ (non-roller) _____ _____ _____ Ear lobe(attached)_____ _____ _____ (not attached)____ _____ _____

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