Colour genetic & heredity

online translated

Topics of this page:

• Color inheritance at Degus
• color Genetics
• Consequences of "breeding" without knowledge of genetics

The inheritance of genes from one generation to the next is not arbitrary and random, but is subject to fixed rules. The Augustinian monk Johann Gregor Mendel was able to prove this regularity of inheritance for the first time in the middle of the 19th century through experimental crossbreeding with the garden pea. In 1865 he published the results of his crossing experiments in his work "Experiments on plant hybrids".

From the results of his experiments, Mendel derived the 3 "Mendelian Laws" of inheritance named after him. The Mendelian Laws have a universal character, they apply to plants and animals becomes.

The genotype is the entirety of all ancestral genes, the phenotype is the external appearance.

The A locus decides whether agouti fur or non-agouti fur, it forms the basis for all other colors.

Genotype AA or Aa: wild-colored animals

Genotype a/a: black animals

Genotype A/A D/D E/E or A/- D/- E/-: (Agouti homozygous)

A degu has the allele combination D / D at the D locus and the allele combination E / E at the E locus i.e. the fur does not have the colors specified by the D&E locus in the pigmented areas.

• The animal is hereditary carrier of the normal allele A / - D / - E / -. The coat color scheme (blue agouti / blue or red, sand, cream) is not available. It is an agouti degu with no color carrier properties.

The B locus produces the color (s) chocholate / chocolate brown / cinnamon and in combination with other loci more colors. So that this locus can influence the coat color, it is necessary that there is at least one E allele at the E locus.

Genotype B/B: (no chocolate-colored degu or chocolate carrier)

A degu has the allele combination B / B at the B locus, i.e. the fur in the pigmented areas does not have the colors specified by the B-Locus (chocolate, cinnamon, brown).

• The animal is a homozygous carrier of the normal allele B. The system for the coat color chocolate / cinnamon is not available.

Genotype B/b: (chocolate carrier / SchokoT)

A degu has the allele combination B / B at the B locus, i.e. the fur does not have the colors defined by the B-Locus (chocolate, cinnamon, brown) in the pigmented areas. However, he passes on the system for these fur colors to his offspring with a probability of 50%.

• The animal is a mixed carrier of the allele b responsible for the coat color chocolate / cinnamon and the normal allele B. Because of the recessive inheritance, the animal itself does not express the coat color chocolate / cinnamon. The system for the coat color chocolate / cinnamon (b) is inherited to the offspring with a 50% probability

Genotype b/b: cinnamon or chocolate animals

A degu with the allele combination b / b at the B locus means that the degu cannot store black pigment (eumelanin) in the hair, but only lighter pigment (the so-called pheomelanin).

• The animal is a pure carrier of the allele responsible for the coat color chocolate / cinnamon b. The system for the coat color chocolate / cinnamon is passed on to the offspring with a 100% probability.

The C locus suppresses the formation of all pigments and thus creates albinism and all variations that are formed with the help of the C locus and corresponding other genes.

Genotype c/c: albinotic animals

The D locus creates the color (s) blue, blue (agouti) and, in combination with other loci, additional colors.

Genotype D/D: (no blue degu or blue carrier)

A degu has the allele combination D / D at the D locus, i.e. the fur does not have the colors defined by the D-Locus (blue agouti, gray, silver) in the pigmented areas.

• The animal is a homozygous carrier of the normal allele D. The system for the coat color blue agouti / blue is not available.

Genotype D/d: (blue carrier / BT)

A degu has the allele combination D / d at the D locus, i.e. the fur does not have the colors defined by the D-Locus (blue agouti, gray, silver) in the pigmented areas. However, he passes on the system for these fur colors to his offspring with a probability of 50%.

• The animal is a mixed-carrier of the allele (d) responsible for the coat color blue agouti / blue and the normal allele D. Because of the recessive inheritance, the animal itself does not develop the coat color blue agouti / blue. The system for the coat color blue agouti / blue (d) is inherited to the offspring with a 50% probability.

 Genotype d/d: (blue-colored degu)

A degu with the allele combination d / d at the D locus, i.e. the fur has the colors defined by the D-Locus (blue agouti, gray, silver) in the pigmented areas.

• The animal is the hereditary carrier of the allele responsible for the coat color blue agouti / blue (d). The plant for the coat color blue agouti / blue is inherited to the offspring with a 100% probability.

The e-locus produces the color (s) sand, red and in combination with other loci other colors.

Genotype E/E: (no sand-colored degu or sand carrier)

A degu has the allele combination E / E at the E-Locus, i.e. the fur does not have the colors defined by the e-locus (red, sand, cream) in the pigmented areas.

• The animal is a homozygous carrier of the normal allele E. The system for the coat color red / sand is not available.

Genotype E/e: (sand carrier / ST)

A degu has the allele combination E / e at the E-Locus, i.e. the fur does not have the colors defined by the e-locus (red, sand, cream) in the pigmented areas. However, he passes on the system for these fur colors to his offspring with a probability of 50%.

• The animal is a mixed carrier of the allele e responsible for the coat color red / sand and the normal allele E or EM. Because of the recessive inheritance, the animal itself does not have a red / sand coat color. The attachment for the coat color red / sand (e) is inherited to the offspring with a 50% probability.

Genotype e / e: (sand-colored degu)

A degu with the allele combination e / e at the e-locus means that the degu cannot store black pigment (eumelanin) in the hair, but only lighter pigment (the so-called pheomelanin). This phaeomelanin can have all possible color levels from reddish to yellowish to whitish-cream.

• The animal is the hereditary carrier of the allele E responsible for the coat color red / sand. The plant for the coat color red / sand is inherited to the offspring with a 100% probability.

Mendelian inheritance is a type of biological inheritance that follows the principles originally proposed by Gregor Mendel in 1865 and 1866, re-discovered in 1900 and popularised by William Bateson. These principles were initially controversial. When Mendel's theories were integrated with the Boveri–Sutton chromosome theory of inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics. Ronald Fisher combined these ideas with the theory of natural selection in his 1930 book The Genetical Theory of Natural Selection, putting evolution onto a mathematical footing and forming the basis for population genetics within the modern evolutionary synthesis.

Please read the article for further understanding.

Source Wikipedia