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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
slide3
Experiments in Heredity
  • Garden Pea (Pisum sativum)

Today

Molecular Genetics:

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

slide8
2. Crossed 2 P Generation plants that had contrasting traits

Example: Purple Flower x White Flower

  • offspring gave 1st generation plants

(F1 Generation)

slide10
F1 generation self-pollinated

- gave 2nd generation (F2 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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