ANSC 4395 Exam 3 Questions And
Answers With Verified Solutions Already
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Simply-Inherited Traits - ANSWER✔✔- traits affected by only a few genes
- qualitative or categorical
- rarely quantitative
- typically not affected by the environment
Polygenic Traits - ANSWER✔✔- affected by many genes with no gene having an
overriding influence
- typically quantitative or continuous in expression
- greatly influenced by the environment
Threshold Traits - ANSWER✔✔polygenic traits that have categorical phenotypes
Which are more important? - ANSWER✔✔- typically, polygenic traits
- traits that determine productivity & profitability
Test Matings - ANSWER✔✔- matings designed to reveal the genotype of an
individual for a small number of loci
- simply-inherited traits
3 general types of test matings to determine if an individual is heterozygous: -
ANSWER✔✔1) mating to recessives
2) mating to heterozygots
, 3) mating a sire to his daughters
the method with the highest probability of detection: - ANSWER✔✔mating to
recessives
Quantitative - ANSWER✔✔- measured on a numerical scale
- under the influence of many genes and the environment
- express a continuous distribution from one extreme to the other
- no discreet phenotypic classes like qualitative traits
"normal" distribution or "bell curve" - ANSWER✔✔- phenotypes will closely
approximate a statistical distribution
- allows us to use statistics to describe populations and their genetic makeup
Statistic - ANSWER✔✔estimate of a parameter
Parameter - ANSWER✔✔a value that describes a population
Population - ANSWER✔✔all the members of a group
Sample - ANSWER✔✔- subset of a population
- can seldom measure all the members of a population
Variables - ANSWER✔✔whatever trait is measured on a group of individuals
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