Chapter 9 1 mendel s legacy
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Chapter 9:1 Mendel’s Legacy. Gregor Johann Mendel. Born 1822: Austria Son of a peasant farmer At 21, entered monastery in Brunn, Austria Ordained into priesthood Studied math and science at University of Vienna Returned to monastery taught school and kept a garden. Experiments in Heredity

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Gregor johann mendel
Gregor Johann Mendel

  • Born 1822: Austria

  • Son of a peasant farmer

  • At 21, entered monastery in Brunn, Austria

  • Ordained into priesthood

  • Studied math and science at University of Vienna

  • Returned to monastery taught school and kept a garden




Mating is easily controlled
Mating is easily controlled

  • Male and Female reproductive parts on same flower

  • Self-Fertilization

  • Cross pollinate


Get results quickly
Get Results Quickly

  • Plants are small, grow easily

  • Produce many offspring quickly


Mendel s experiments one contrasting trait
Mendel’s Experiments: One contrasting trait

  • Garden pea was self-pollinated for several generations

    • Ensures True-Breeding: that all the offspring would display only one form of a trait

    • Parental Generation (P Generation)

      Example: All Purple Flowers

      All White Flowers


2. Crossed 2 P Generation plants that had contrasting traits

Example: Purple Flower x White Flower

  • offspring gave 1st generation plants

    (F1 Generation)



Results
Results

  • F1 plants showed only 1 form of trait (Purple)

  • Contrasting trait (white) disappeared

  • F2 plants-contrasting trait (white) appeared in some

    Ratio 3:1


Conclusion
Conclusion

  • For each individual trait, an individual has two copies of the gene-one from each parent

  • There are alternative versions of genes (called alleles)

  • When two alleles occur together, one of them may be completely expressed, while the other may have no observable effect on the organism’s appearance

    Dominant: Trait that is expressed

    Recessive: Trait that is expressed only when both recessive alleles re present


Conclusion cont
Conclusion cont.

  • Law of Segregation: pair of factors is segregated, separated, during the formation of gametes

  • Law of Independent Assortment: factors separate independently of one another during formation of gametes


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