ANSC 4395 Exam 3 Questions and
Answers Graded A+
Simply-Inherited Traits - Correct answer-- traits affected by only a few genes
- qualitative or categorical
- rarely quantitative
- typically not affected by the environment
Polygenic Traits - Correct 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 - Correct answer-polygenic traits that have categorical phenotypes
Which are more important? - Correct answer-- typically, polygenic traits
- traits that determine productivity & profitability
Test Matings - Correct answer-- matings designed to reveal the genotype of an
individual for a small number of loci
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, - simply-inherited traits
3 general types of test matings to determine if an individual is heterozygous: -
Correct answer-1) mating to recessives
2) mating to heterozygots
3) mating a sire to his daughters
the method with the highest probability of detection: - Correct answer-mating to
recessives
Quantitative - Correct 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" - Correct answer-- phenotypes will closely
approximate a statistical distribution
- allows us to use statistics to describe populations and their genetic makeup
Statistic - Correct answer-estimate of a parameter
Parameter - Correct answer-a value that describes a population
Population - Correct answer-all the members of a group
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Answers Graded A+
Simply-Inherited Traits - Correct answer-- traits affected by only a few genes
- qualitative or categorical
- rarely quantitative
- typically not affected by the environment
Polygenic Traits - Correct 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 - Correct answer-polygenic traits that have categorical phenotypes
Which are more important? - Correct answer-- typically, polygenic traits
- traits that determine productivity & profitability
Test Matings - Correct answer-- matings designed to reveal the genotype of an
individual for a small number of loci
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, - simply-inherited traits
3 general types of test matings to determine if an individual is heterozygous: -
Correct answer-1) mating to recessives
2) mating to heterozygots
3) mating a sire to his daughters
the method with the highest probability of detection: - Correct answer-mating to
recessives
Quantitative - Correct 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" - Correct answer-- phenotypes will closely
approximate a statistical distribution
- allows us to use statistics to describe populations and their genetic makeup
Statistic - Correct answer-estimate of a parameter
Parameter - Correct answer-a value that describes a population
Population - Correct answer-all the members of a group
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
