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Look at the Parent and F1 generation above. Predict possible genotypes for the parent flowers. Draw a Punnett Square to demonstrate the possible offspring and what their phenotypes should be. **A blending effect occurs**. Incomplete Dominance. Neither allele completely dominant - PowerPoint PPT Presentation
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Look at the Parent and F1 generation above. Predict possible genotypes
for the parent flowers. Draw a Punnett Square to demonstrate the possible offspring and what their
phenotypes should be.
**A blending effect occurs**
Incomplete Dominance• Neither allele completely dominant
• Heterozygous genotype somewhere between homozygous phenotypes (blending)
Example: Red flower x white flower →
pink flowers
Mike Wazowski is a resident of Monsters, Inc. Land. His Dad is BB for blue colorHis Mom is YY for yellow colorWhat do you think Mike’s genotype is???
Examples…
• What does this mean about inheritance of skin color in this species of monster?
CodominanceBoth alleles contribute to phenotype
See both phenotypes in offspring Examples: Black x white chicken → speckled
chicken
Examples…The Wiley Coyote Bird of the deserts has a black and red stripes on its body. Homozygous BB is black stripes only
Homozygous RR is red stripes onlyHeterozygous BR is ???
Examples…
x
Red horse x white horse
results in ROAN – both colors
expressed
Multiple AllelesGenes that are controlled by more than
2 allelesExample: Rabbit coats – 29 different
alleles determine coloration
Ex: Blood Types
Polygenic TraitsTraits controlled by interactions
between 2 or more genesDifferent combos, diff phenotypes
Example: Skin color Height
Sex LinkageEx: Color-blindness
Gene carried on X - more males than females. Why?
* Males – XY* Females – XX
• Males have ONE X → ALL x-linked traits are expressed even if they are recessive• Second X can mask trait in females
Trait:Sight: Normal – E
colorblind – e
Gender: Male – Y Female – X
Normal Vision Male: XEYCarrier Female: XEXe
Example: HemophiliaDisorder in which blood does not
clot normally