Genetics Flashcards
Define Heterozygosity
Individual inherits different forms of a particular gene from each parent
Define homozygosity
When a individual inherits the same alleles for a particular gene from each parent
Line breeding put 1 benefit
Concentrating on one desirable traits
Line Breeding put 1 Drawback
- also concentrated on undesirable traits aswell
List 3 genetic defects commonly associated with line breeding
- HERDA
- MH
- PSSM
What % of blood is contributed by an ancestor in the third generation?
12.50%
What % of blood is contributed by an ancestor in the fourth generation?
6.25%
How is % of blood calculated on a horses pedigree?
Expressed as 3X4X5 or a % for each generation
Define Heterosis
Increase in vigor as a result of mating parents from different species, isolated populations or selected strains within species or populations
Define outcross
2 unrelated individuals within a breed
Define cross bred
Between two breeds
Define linecross
A line bred individual from one family crossed with a line bred individual from another family
What percent of abortions are related to GBED
3%
What is the mode of inheritance for HERDA ?
Autosomal Recessive
When are HERDA symptoms most often detected in carriers?
Age of 2 and when the horse is broke to saddle
