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
- 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
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
- 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
