Dominance of TraitsChelsea Denhard

Basic Terms Trait: a specific characteristic (color, hair, etc.)

Heterozygous: two different alleles; one dominant, one recessive

Homozygous: two alleles that are the same; homozygous dominant or recessive

Hybrid: offspring of crosses between parents with different traits

Incomplete Dominance: when an allele isn’t completely dominant over another

Codominance: when both alleles are seen

Incomplete Dominance Even with purebred dogs, incomplete

dominance is shown, as seen in the next slide, when one trait, in this case color, isn’t completely dominant.

&

You can see incompletedominance here. Kinzel and

Ivan’s puppies aren’t onespecific color. The traits

aren’t completely dominant.

Hybrids If a dog isn’t a purebred it’s a hybrid. A

Shih-tzu bred with a Yorkie will produce Shorkies, a hybrid. Also, a Poodle and a Yorkie will give you a Yorkie Poo.

Shorkie(Shih Tzu mom,

Yorkie dad)

Yorkie Poo(Poodle mom,

Yorkie dad)

Codominance Looking at hybrids, we can see

codominance. Both parents’ genes can be seen.

Lily, a Chihuahua/Poodle mixChihuahua Traits•Hair: She has coarse hair that doesn’t have to be groomed very often•Ears: She has Chihuahua ears that stick up when she’s excited

•Face: She has the poodle face, with a long-ish nose and large eyes•Body: She has the poodle build

Poodle Traits

CodominanceChloe, a Shih Tzu/Pomeranian mix

Shih Tzu Traits Pomeranian Traits•Face: Her face has a “squished in” appearance, which is the Shih Tzu face•Tail: Her tail curves up, like the Shih Tzu•Build: She has the stocky, short Shih Tzu build

•Hair: She has fluffy hair, like a Pomeranian•Ears: Her ears are floppy and large, like Pomeranians

Dominant Traits in Yorkieshttp://www.yorkietalk.com/forums/breeder-talk/191831-recessive-yorkie.html

Dominant Traits in Chihuahuas

http://www.prouxchihuahuas.com/id61.html

SHORT long

SHORTSHORT/SHORT

SHORT/long

long SHORT/long Long/long

long long

SHORTSHORT/long SHORT/long

long long/long Long/long

With two heterozygous parents, three puppies will have short

hair.

With one heterozygous parent,and one homozygous recessive, two puppies will have short hair.

Works Cited All pictures: Dogz by Design

www.dogzbydesign.com If you ever want to buy small house dog, let us know!

Prentice Hall: Biology science book

http://www.yorkietalk.com/forums/breeder-talk/191831-recessive-yorkie.html

http://www.prouxchihuahuas.com/id61.html