Exam (elaborations)
ANSC 4395-Breeding & Genetics FINAL Exam
- Course
- Institution
ANSC 4395-Breeding & Genetics FINAL Exam
[Show more]
Content preview
ANSC 4395-Breeding & GeneticsFINAL Exam
Simply-Inherited Traits: - -Traits affected by only a few genes
EX: Coat color, Horns
-Simply-inherited Traits:
-Qualitative or categorical - -Either/or expression
EX: Black or red, Horned or polled
-Simply-inherited Traits are rarely... - -quantitative (Measured with numbers
or continuous)
EX: White spotting in cats (1-9 numerical rating)
-Simply-inherited Traits are typically, affected very little by... - -environment
EX: Chocolate lab may bleach out if left in the sun, but there is no mistaking
it for a black or yellow lab
-Polygenic Traits: - -Affected by many genes with no gene having an
overriding influence
EX: Growth rate, Milk production, Ribeye area
-Polygenic Traits are typically... - -quantitative or continuous in expression
-Phenotypes are usually described by numbers
EX: Weaning weights, Milk yield, Ribeye Area
-Polygenic Traits are greatly influenced by... - -environment
-Lack of feed
-Heat/cold stress
-Training of quarter horses (speed)
-Some polygenic traits have categorical phenotypes, called what? - -
Threshold Traits
-Pregnancy (pregnant or not pregnant)
-Dystocia (1-5)
-Natural gait (trotter or pacer)
-Influenced by many genes but have an either/or result
, -Between simply-inherited and polygenic traits, which is more important? - -
Typically, polygenic traits
-Growth rate, fertility, milk production
-Traits that determine productivity and profitability
-Traits: Some markets are more sensitive to... - -simply-inherited traits
-Coat or feather color
-Polled
-Genetic defects are usually... - -simply-inherited
-Common Characteristics of Simply-inherited & Polygenic Traits: - --Both are
subject to the same Mendelian mechanisms (Laws of segregation &
independent assortment)
-Dominance and epistasis affect both
-Principles of selection and mating apply to both (attempt to increase the
frequencies of favorable alleles)
-Different Breeding Approaches-
Function of the number of genes involved: - --The more genes involved, the
more difficult it is to observe the effects of individual genes, and therefore
the less specific info we have about those genes
-More "noise" in equation
-When a few or one gene affects a trait, the effects of those genes are well
understood (EX: Color, Polled)
-What are test matings? - -Matings designed to reveal the genotype of an
individual for a small number of loci
-Simply-inherited traits
-Test Matings-
Polygenic traits: - -Polygenic traits have so many genes affecting them that
this is impossible
-Can not observe the effects of specific genes
-Have to characterize the net effect
-EX: Breeding Values, EPDs
-There are 3 general types of test matings to determine if an individual is
heterozygous: - --Mating to recessives
-Mating to heterozygotes
-Mating a sire to his daughters
-The method with the highest probability of detection is... - -mating to
recessives
-Probability of siring a recessive offspring is 1/2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Nursephil2023. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now