Incomplete & Codominance Biology Honors 8.5. Exceptions to Mendel’s Work Pea plants show complete...
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Transcript of Incomplete & Codominance Biology Honors 8.5. Exceptions to Mendel’s Work Pea plants show complete...
![Page 1: Incomplete & Codominance Biology Honors 8.5. Exceptions to Mendel’s Work Pea plants show complete dominance only Pea plants show complete dominance only.](https://reader033.fdocuments.us/reader033/viewer/2022061607/56649cee5503460f949bb657/html5/thumbnails/1.jpg)
Incomplete & Codominance
Biology Honors8.5
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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)
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Incomplete Dominance
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Incomplete Dominance Blending of traits
Neither allele dominates the other Three genotypes = three phenotypes Example: RED flower x WHITE flower PINK
flower
RR = red rr = white Rr = pink
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Incomplete Dominance
Make a key to help you!
RR = Red
Rr = Pink
rr = White
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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
![Page 8: Incomplete & Codominance Biology Honors 8.5. Exceptions to Mendel’s Work Pea plants show complete dominance only Pea plants show complete dominance only.](https://reader033.fdocuments.us/reader033/viewer/2022061607/56649cee5503460f949bb657/html5/thumbnails/8.jpg)
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?
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Codominance
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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)
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Codominance Make a key to help
you!RR = RedRr = Roan (red &
white)rr = White
![Page 12: Incomplete & Codominance Biology Honors 8.5. Exceptions to Mendel’s Work Pea plants show complete dominance only Pea plants show complete dominance only.](https://reader033.fdocuments.us/reader033/viewer/2022061607/56649cee5503460f949bb657/html5/thumbnails/12.jpg)
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.
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A purple and black legged male mates with a black legged female. What is the chance of having purple legged offspring? Show the cross.