Incomplete codominance
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Incomplete & Codominance. Biology Honors. Exceptions to Mendel’s Work. Pea plants show complete dominance only Ex: purple flowers are dominant to white flowers PP=purple Pp =purple p p =white Sometimes genetics are more complex than that! (actually, they usually are).

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Incomplete & Codominance

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Incomplete codominance

Incomplete & Codominance

Biology Honors


Exceptions to mendel s work

Exceptions to Mendel’s Work

  • Pea plants show complete dominance only

  • Ex: purple flowers are dominant to white flowers

    • PP=purple

    • Pp=purple

    • pp=white

  • Sometimes genetics are more complex than that! (actually, they usually are)


Incomplete dominance

Incomplete Dominance


Incomplete dominance1

RR = red

rr = white

Rr = pink

Incomplete Dominance

  • Blending of traits

    • Neither allele dominates the other

  • Three genotypes = three phenotypes

  • Example:

  • REDflower x WHITE flower PINKflower


Incomplete dominance2

Incomplete Dominance

Make a key to help you!

RR = Red

Rr = Pink

rr = White


Practice practice practice

Practice, practice, practice!

  • Oompa Loompa can have red (R), blue (r) or purple hair. Purple hair results from the heterozygous condition. Make a "key" showing the genotypes and phenotypes for hair color.

  • RR = red

  • rr = blue

  • Rr = purple


Incomplete codominance

  • Olivia Oompa is married to Odo Oompa and they both have purple hair. What color hair and in what proportion would you expect their children to have?


Codominance

Codominance


Codominance1

Codominance

  • Both traits are shown

    • Both alleles are dominant together

  • red x whitered & white spotted

    RR x rrRr

  • Think “co-” is together (cooperate, coexist)


Codominance2

Codominance

  • Make a key to help you!

    RR = Red

    Rr = Roan (red & white)

    rr = White


Practice practice practice1

Practice, practice, practice

  • In a certain species of frogs, purple legs (L) are dominant to black legs (l), but heterozygous genotype results in purple and black legs. Set up a key to show this.


Incomplete codominance

  • A purple and black legged male mates with a black legged female. What is the chance of having purple legged offspring? Show the cross.


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