33)Oligogenic inheritance: pathological traits, threshold taits, genetic predisposition Flashcards
1
Q
Oligogenic inheritance
A
A phenotypic outcome that is determined by a few genes
2
Q
Pathological traits
A
Abnormalities that cause change in the structure or function in the body
3
Q
Threshold traits
A
Many different genes and environmental circumstances determine jointly which phenotype an individual should express
4
Q
Threshold traits are divided into…
A
- Single threshold traits
- Multiple threshold traits
5
Q
Single threshold traits
A
- Mortality
- Bone breaks/remains functional
- Polydactyl (1 extra digit)
- Single/twin birth
6
Q
Multiple threshold traits
A
Trait with more than 1 threshold
- Pigs: may have 26/27/28 presacral vertebrae
- Mastitis in cattle
- Blood spots in chicken eggs
7
Q
As the no. of threshold traits increase…
A
The error caused by coarseness of grouping decrease
8
Q
Genetic predisposition
A
- Genetic characteristic
- Influences the possible phenotypic development of an individual organism
- Within a species or population
- Under the influence of environmental conditions
9
Q
Genetic susceptibility
A
- Genetic predisposition to a health problem
- May be triggered by a particular environmental factor
- E.g smoking tobacco
- Can be identified by genetic testing
