Equine Genetics

Question 1

amount of chromosomes

Answer 1

64
-31 pairs of autosomes
-1 pair of sex chromosomes

Question 2

haploid

Answer 2

gametes contain half of the genetic material, one set of chromosomes

Question 3

diploid

Answer 3

2 sets of chromosomes
–> offspring are genetically different

Question 4

genotype determines _____________

Answer 4

phenotype

Question 5

the blocking factor

Answer 5

WHITE: WW or Ww=white, ww=not white

Question 6

the gray factor

Answer 6

GRAY: GG or Gg=gray, gg=not gray

Question 7

the extension factor

Answer 7

BLACK OR RED: EE or Ee=black (has black somewhere), ee=red

Question 8

the agouti factor

Answer 8

WHERE BLACK IS LOCATED: AA or Aa=bay/brown, aa=black

Question 9

the dun dilution factor

Answer 9

DUN FACTOR: DD or Dd=dun, dd=not dun

Question 10

the cream dilution factor

Answer 10

CREAM FACTOR:
-CC=full color
-CCr=red diluted to yellow, black unaffected
-CrCr= red and black pigments diluted

Question 11

the roan factor

Answer 11

ROAN: RNRN or RNrn=roan, rnrn=not roan

Question 12

glycogen branching enzyme deficiency (GBED)

Answer 12

inability to convert glucose to glycogen

Question 13

hereditary equine regional dermal asthenia (HERDA)

Answer 13

skin disorder, causes lesion’s on the skin when rubbed

Question 14

hyperkalemic periodic paralysis disease (HYPP)

Answer 14

muscle disease, causes unpredictable muscle twitches

Question 15

malignant hyperthermia (MH)

Answer 15

muscle disorder, adverse reaction to anesthesia, work, and/or stress

Question 16

polysaccharide storage myopathy - type 1 (PSSM1)

Answer 16

genetic for of tying up, make and store abnormal glycogen

Question 17

overo lethal white syndrome (OLWS)

Answer 17

disconnection between neurologic and gi tract development, foals are born healthy but will soon have stomach issues and die or need to be euthanized