**a blending effect occurs**

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