57) Basic colors, most common gene functions of the coat color

Question 1

Give the alleles of basic coat colours

Answer 1

• E+
• EsuperD
• e

Question 2

E+ allele

Answer 2

• Normal, MSH dependent tyrosinase activity
• Different eu- and phaeomelanin production
• Creates agouti colour

Question 3

EsuperD

Answer 3

• Continuous tyrosinase activity
• MSH-binding not necessary
• Only eumelanin produced
• = non-agouti protein = black colour

Question 4

e

Answer 4

• Low tyrosinase activity
• Non-functional receptor
• Red coat colour
• Only pheomelanin produced

Question 5

List the pigment types

Answer 5

• A - Agouti
• B - Brown
• C - Albino, no colour
• E - Extension
• D - Grey
• Indowhite - Palamino
• R - Roan

Question 6

Albinism

Answer 6

• Gene effect causes tyrosinase activity inside melanocyte cells
• Disrupts melanocyte-production (Enzyme needed for first step)
• No pigments created