Dachshund Traits
This section is mostly for breeders. However it
will be useful to all those that would like to know the genetic
makeup of their dog. It takes some work and time to figure out a
dogs genotype. You may never get a complete picture. The genetic
cross is ( Punnet square ) a way to predict the probabilities of
the outcome of a specific breeding.
This information was collected, rearranged,
verified, some parts deleted, some parts added but most of it
from two sources. Dog Coat and
Colour Genetics, which has a number of pictures to go along
with its descriptions. Eridox
Dachshunds Resource website, which is up to date with its
information, which is not just limited to genetics.
Let us define some terms:
- Allele - is a viable DNA
(deoxyribonucleic acid) coding that occupies a given locus on a
chromosome. Usually alleles are sequences that code for a gene,
but sometimes the term is used to refer to a non-gene
sequence.
- Chromosome - a strand of DNA that is
comprised of genes.
- Dihybrid - two traits
- Dominate - Only 1 gene needed for trait
to be expressed (visibly appear). Dominant alleles are usually
written with capital letters.
- Eumelanin - black and/or brown pigment,
whether diluted or undiluted (this includes black, chocolate,
blue, and isabella)
- Gene - a sequence/section of DNA that
is comprised of detailed genetic information.
- Genotype - The genes it carries, that
are present genetically but that are not necessarily visibly
seen.
- Heterozygous - Alleles different, one
dominate and one recessive.
- Homozygous - Both of the alleles the
same, two dominate, or two recessive, pure.
- Incomplete dominance - Sometimes both of the genes on
a locus will be expressed.
- Locus - Genes are all tied together into a long strand
of DNA. Each point on this strand of DNA is called a locus (loci
is the plural). At each locus there are two genes. A
point/location on a chromosome that usually corresponds to a
specific type of trait in a gene that can be determined by means
of genetic testing
- Monohybrid - one trait, or sets of alleles
- Pheomelanin - red pigment, whether diluted or
undiluted (this includes red, blush, cream, buff, etc.)
- Phenotype - What something looks like, or the visible
appearance of two gene's effects .
- Polygenic - a trait that is caused by the interaction
of alleles at more than one locus on a gene.
- Recessive - Two genes needed for trait to be
expressed. Recessive alleles are usually written with lowercase
letters.
- To carry for - a trait that is present genetically but
that is not necessarily visibly seen.
- Trait - a noticeable feature/quality; traits are
determined by genetics and/or the environment
Monohybrid Cross (
Punnet square )
These three examples are all the types of problems that you
will see for a monohybrid cross. The type of genes might change
and with them the phenotypes. However the pattern will remain the
same.
Dihybrid Cross (
Punnet square )
First I am not going to show you all the possible types of
dihybrid crosses, it takes too much space. What I will show you
is the most difficult type and the methods that you need to solve
the problems. You might notice that the monohybrid cross uses 4
squares and the dihybrid cross has 4 X 4 or 16 squares.