Poultry Genetics -Chromosome Linkages

Chromosome Linkages Sub-Menu

..... Introduction:
..... Chromosome Linkages Table:

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Last updated: 27 May, 2007

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Linkages

Introduction on linkages
Linkages tables, categorised into chromosome groups
Map units

Chromosome Linkages Table

The following linkage map table is based on the following books:

1. Crawford (ed.) (1990) *Poultry Breeding and Genetics.*
2. Stevens, L. (1991) *Genetics and Evolution of the Domestic Fowl*.
3. Muir and Aggrey (ed.) (2003) *Poultry Genetics, Breeding and Biotechnology*, CABI Publishing.

# All hashed data is from the last book (Muir & Aggrey), & is based on the following quote from this book (page 499):

The classical linkage groups I, IV and Z correspond to chromosomes 1, 2 and Z, and linkage group II to linkage group E22C19W28. These results also clearly show that several of the linkages reported in the past are incorrect. For example, naked neck and blood group P are located not on chromosome 1 (linkage group 1) but on chromosome 3 and extension of eumelanin (MC1R) is not located on chromosome 1 but located on microchromosome 11 (Takeuchi et al., 1996; Sazanov et al., 1998; Kerje et al., 2003, unpublished).

*Note, the recessive white locus (Tyrosinase) map reference is from Dr Ron Okimoto (pers. comm.)

Locus	Map Unit Distance	Locus Description	Comments
Group I : (# Chromosome 1- new)
Cp		Creeper
	0.4
R		Rose Comb
	30
U		Uropygial	linkage not given to lav
----------------------------	-----------	------------------	--------------
the below not linear
lav	32.5	Lavender	lav 32.5 map units to R
	?		linkage not given between lav & Mp
Mp	16		Mp 16 map units to R
the above not linear

Group II (# linkage group E22C19W28- new)
fr		Fray
	46
Cr		Crest
	12.5
I, I^D, I^S		Dominant White, Dun, Smoky
	17
F		Frizzle

Group III: (# Chromosome 1- old)

w		Yellow Skin
	22
Ea-H		Blood Group H
	21
se		Sleepy Eye	se is 45 map units from P
	3
Ea-J		Blood Group J
p	36
O		Blue Egg-Shell
	4
Cha		Charcoal
	0.3
P		Pea Comb	*Carefoot believed E locus linked to P -43 cM, this later determined incorrect.
	32
Db		Dark Brown	Db is 32 Map units from P
	12
Ml		Melanotic	Ml is 45 + map units from P
	10
Pg		Pattern
	?
T		Tardy
	?
Ea-P		Blood Group P	(#Chromosome 3 -new)
	28
Na		Naked Neck	(#Chromosome 3 -new)
q	43
h		Hookless - Silkiness
	11
Fl		Flightless
	?
c		Recessive White	Tyrosinase

Group IV (#Chromosome 2 -new)
D^V, D^C		Duplex Comb
	27
M		Multiple Spurs
	33
Po, Po^d		Polydactyly, Duplicate

*Group V: (Z Chromosome -sex chromosome)*

ro		Restricted Ovulator
	3
sh		Shaker
p	14
n		Naked
	7
px		Paroxysm
	1.9
ln		Liver Necrosis
	3.1
dw^B, dw^M, dw		Dwarf
	3.4
wl		Wingless
	0.6
pn		Prenatal Lethal
	3
Kⁿ, K^s, K		Slow Feathering
	1.1
S, S^al-s, s^al		Silver, Imperfect Albinism
	4
lk		Lady Killer
	12
Li		Light Down
	7
y		Recessive White Skin
	13
br		Brown Eye
q	27
Id, id^a, id^c,id^M		Dermal Melanin Inhibitor
	14
B^Sd, B		Sex-linked Dilution, Barring
	13
ko		Head Streak

*Group VI: (W Chromosome -sex chromosome- females only)*


Group VII (Chromosome 6)
the below not linear
Gc, Alb
Ade-A
Pgm-2
the above not linear

Group VIII (Chromosome 7)
Ade-B			adenine synthesis B

Group X (Microchromosome 17)

p
B-G

Ea-B
	0.4
B-F		MHC
R-Rs 1
B-L
lr-GAT
NOR		Nucleolar organiser region
q

Ea-B

#Microchromosome 11

E, E^R, E^R- Fay, e^Wh, e⁺, e^b, e^s, e^bc, e^y, e^q		E Series

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