Genetics Pre/Post Test


Section I. Matching

Directions

In this section, you will:

  1. click on an item in either Column A or B,
  2. click on your answer in the other column,
  3. the matched pair will be automatically entered in the Preview Area at the bottom of the table,
  4. in the Preview Area:
  5. if at any point you are NOT satisfied with a matched pair in the Matched Pairs Area, simply click on the "Remove matched pair" button next to the matched pair and the matched pair will be removed from the Matched pairs Area.
  6. continue until all matched pairs have been added to the Matched Pairs Area,
  7. continue to next section.

Column AColumn B
Phenotypic value
Refers to the effect of the goat's genes-singly and in combinations.
Genotypic value
Comprised of all non-genetic factors influencing an individual's performance for a particular trait and is not directly measurable.
Environmental effect
An individual performance record. It is the measure of a meat goat's own performance for some specific trait.

Mating systems
Backcrossing
Mating that involves repeated backcrosses but does not include any attempt to select for a specific allele.
Upgrading
Mating of a crossbred back to a purebred of one of the parental breeds or lines.
Random mating
Mating of individuals from different breeds.
Inbreeding
Mates are chosen at random.
Linebreeding
Mating of relatives.
Outbreeding
Mating of individuals within a particular line.
Crossbreeding
Mating of unrelated individuals.

General terms
Phenotype
The basic unit of inheritance.
Heritability
An observable or measurable characteristic of an individual goat.
Heterosis
Measure of the strength of the relationship between repeated records.
DNA
Increase in the performance of hybrids over that of purebreds, most noticeably in traits related to fertility and survivability.
Genes
A very complex molecule that forms the genetic code for all living things.
Repeatability
Referring to an animal's appearance.
Trait
Reflection of the degree to which offspring performance is a reflection of the performance of their parents.
 


Preview Area




Matched Pairs Area


1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Section II. Multiple Selection

Directions

In this section, you will:

  1. click on your choices

1. There are four important traits of a production system. Which of the statements below represent those important traits?

The animal genotype
The animal phenotype
The physical environment
Fixed resources and management factors
Economic and social considerations


2. Which one of the statements below represents polygenic traits?

Affected by many genes and no single gene are thought to have an overriding influence.
Affected by only a few genes


3. Select the factors below that influence weaning weights.

Age of dam
Age of kid
Sex of kid
Type of birth
Type of rearing