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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 l.jpg
EXTENSION OF MENDEL’S RULES

  • Phenotypic variation is not always due to simple dominance/recessive-ness of genes


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EXTENSION OF MENDEL’S RULES

Some Traits Deviate from Mendelian Patterns:

  • Incomplete Dominance:

  • Co Dominance:

  • Environmental Effects:

  • Quantitative Traits:


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INCOMPLETE DOMINANCE

  • No Allele Is Completely Dominant


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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


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INCOMPLETE DOMINANCE

  • Red allele = red pigment

  • White allele = no pigment

  • In heterozygous form


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CODOMINANCE

  • Two alleles specify different phenotypes, but…


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CODOMINANCE

Blood type:

  • Determined by type of carbohydrate on RBC membrane

    • 3 possible alleles:


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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


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CODOMINANCE

  • ABO Blood System:


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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


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ENVIRONMENTAL EFFECTS

  • Environmental conditions help

    determine expression of genotype

  • Ex:


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ENVIRONMENTAL EFFECTS

  • Temp. sensitive enzyme acts at surface of body:


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QUANTITIVE TRAITS

A result of more than one gene contributing to phenotype

Polygenetic Inheritance:


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