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POST MENDELIAN GENETICS. EXTENSION OF MENDEL’S RULES. Phenotypic variation is not always due to simple dominance/recessive-ness of genes. EXTENSION OF MENDEL’S RULES. Some Traits Deviate from Mendelian Patterns: Incomplete Dominance: Co Dominance: Environmental Effects:

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extension of mendel s rules
EXTENSION OF MENDEL’S RULES
  • Phenotypic variation is not always due to simple dominance/recessive-ness of genes
extension of mendel s rules3
EXTENSION OF MENDEL’S RULES

Some Traits Deviate from Mendelian Patterns:

  • Incomplete Dominance:
  • Co Dominance:
  • Environmental Effects:
  • Quantitative Traits:
incomplete dominance
INCOMPLETE DOMINANCE
  • No Allele Is Completely Dominant
slide5
Incomplete dominance

in Snapdragon flower color

Parental

generation

X

RR

rr

F1 generation:

All Heterozygotes

Rr

Self-fertilization

F2 generation

1/4 RR

1/4 Rr

1/4 Rr

1/4 rr

Red

Pink

White

incomplete dominance6
INCOMPLETE DOMINANCE
  • Red allele = red pigment
  • White allele = no pigment
  • In heterozygous form
codominance
CODOMINANCE
  • Two alleles specify different phenotypes, but…
codominance8
CODOMINANCE

Blood type:

  • Determined by type of carbohydrate on RBC membrane
      • 3 possible alleles:
codominance9
CODOMINANCE

Blood Type:

  • With alleles: AA or AO, you have
  • With alleles: BB or BO, you have
  • With alleles: OO, you have
  • With alleles: AB, you have
codominance10
CODOMINANCE
  • ABO Blood System:
codominance11
CODOMINANCE
  • Our immune system produced proteins (“antibodies”) that recognize foreign carbohydrates and causes foreign cells to clump together
    • A Blood has
    • B Blood has
    • O Blood has
environmental effects
ENVIRONMENTAL EFFECTS
  • Environmental conditions help

determine expression of genotype

  • Ex:
environmental effects13
ENVIRONMENTAL EFFECTS
  • Temp. sensitive enzyme acts at surface of body:
slide14
QUANTITIVE TRAITS

A result of more than one gene contributing to phenotype

Polygenetic Inheritance:

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