Coat Colour Flashcards
(27 cards)
Total chromosome number
64
Chromosome pairs number
32
What is a gene
Short pieces of DNA coding for a protein
Mutations are…
Variations within genes
Define allele
Different version of the same gene
Loci is the…
location of a gene on a chromosome
What cells divide in mitosis
somatic body cells
What cells divide in meiosis
sex cells
What cell division produces haploid cells
Meiosis
Main loci
white (W or w)
grey (G or g)
Extension (E or e)
Agouti (A or a)
What colour does eumelanin produce
black
What colour does pheomelanin produce
red
What alleles are needed for chestnut
homozygous e
What would produce a bay
A
eumelanin
restricted to points
What would produce black
a
eumelanin
evenly distributed
What are the 2 main dilution genes?
Cream and Dun
What is incomplete dominance
the effect is dependent on the genotype, homozygous or heterozygous
What allele turns red pigment yellow?
Cr
Effect of CC
No effect
Effect of CCr
dilution on mainly red colour
Effect of CrCr
Strong dilution on red and black
Do you need the presence of dominant allele D for dilution to occur in a dun
Yes
What does MC1R do?
protein receptor in cell membrane of melanocyte
detects MSH
controls type of melanin produced
What does a high activity of MC1R produce?
eumelanin - leads to the black phenotype
