Incomplete and Codominance - PowerPoint PPT Presentation

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Incomplete and Codominance

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Incomplete and Codominance Simple Inheritance Mendel studied simple patterns of inheritance. Found that inheritance was controlled by a dominant allele (B) or ... – PowerPoint PPT presentation

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Title: Incomplete and Codominance


1
Incomplete and Codominance
2
Simple Inheritance
  • Mendel studied simple patterns of inheritance.
  • Found that inheritance was controlled by a
    dominant allele (B) or recessive allele (b).
  • However, there are many inheritance patterns that
    are more complex.
  • Most traits arent simply dominant or recessive.

3
Incomplete Dominance
  • -When traits are inherited in an incomplete
    dominance pattern, the phenotype of the
    heterozygous is a blend of the homozygous
    dominant (BB) and the homozygous recessive (bb).
  • Example BB red
  • bb white
  • Bb pink

4
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5
Codominance
  • -Occurs when two or more dominant alleles for a
    gene are expressed.
  • -Neither allele is dominant or recessive no
    blending.
  • Example- in cows, R is for red coat color, W is
    for white coat color. RW roan coat color.
  • RR red, WW white, RW roan
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