11) Important genes related to conformation in breeding Flashcards
1
Q
Conformation
A
The way something is formed/corresponds to a model
2
Q
Coat colour is caused by…
A
- Melanin stimulating hormone + receptor gene of tyrosine
- Melanin synthesis in melanocytes
3
Q
Melanine
A
- Black/brown pigment
- Hair, skin and retina
4
Q
Eumelanine
A
- Normally black
- Coat + retina
5
Q
Phaeomelanine
A
- Yellow/red pigment
- Found in coates
6
Q
Give the alleles of basic colour
A
- E+
- EsuperD
- e
7
Q
E+ allele
A
- Wild type
- Agouti colour
- MSH dependent on tyrosinase activity
- Different eu- and phaeomelanin production
8
Q
EsuperD allele
A
- Dominant or recessive
- Black coat colour
- Continuous tyrosinase activity
- MSH binding not necessary
- Eumelanin
9
Q
e allele
A
- Red coat colour
- ee homozygote
- Low tyrosinase activity
- Non-functional receptor
- Phaeomelanin only
10
Q
List the pigment types
A
- A
- B
- C
- D
- E
- Indowhite
- R
11
Q
Pigment type: A
A
Agouti
The alternation between yellow/black
12
Q
Pigment type: B
A
Brown
13
Q
Pigment type: C
A
Albino
No colouration
14
Q
Pigment type: E
A
Extension
15
Q
Pigment type: D
A
Grey
16
Q
Pigment type: R
A
Roan
even mix of coloured and white hair in horse
17
Q
Pigment type: Indowhite
A
Palamino
Gold coat, white tail in equine
18
Q
Coat colour is registered by how many loci?
A
Minimum 6
19
Q
Polledness
A
- Lacking horns
- Polled is dominant (PP/Pp) to horned (pp)
20
Q
Carpet wool gene
A
- Mutation of New Zealand Romney long wool sheep
- A higher ratio of medullated fibres
- Breeds:
- Drydale
- Tukidale
