dominance of traits
DESCRIPTION
Dominance of Traits. Chelsea 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 - PowerPoint PPT PresentationTRANSCRIPT
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Dominance of TraitsChelsea Denhard
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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
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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.
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&
You can see incompletedominance here. Kinzel and
Ivan’s puppies aren’t onespecific color. The traits
aren’t completely dominant.
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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)
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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
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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
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Dominant Traits in Yorkieshttp://www.yorkietalk.com/forums/breeder-talk/191831-recessive-yorkie.html
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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.
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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