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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

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 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



Codominance

Codominance purple hair. What color hair and in what proportion would you expect their children to have?


Codominance1
Codominance purple hair. What color hair and in what proportion would you expect their children to have?

  • 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 purple hair. What color hair and in what proportion would you expect their children to have?

  • Make a key to help you!

    RR = Red

    Rr = Roan (red & white)

    rr = White


Practice practice practice1
Practice, practice, practice purple hair. What color hair and in what proportion would you expect their children to have?

  • 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.



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