Know the definition of #homozygous and #heterozygous.
In all cells of the body, chromosomes exist in pairs, one of which is inherited from the paternal parent and the other from the maternal parent. Therefore, all genes exist in pairs. These genes
They may be identical: the allele inherited from the paternal parent is identical to the allele from the mother. So a dam is homozygous for that gene. This shows that the ancestors of this animal always have this allele
This parent receives The alleles inherited from the paternal parent and the maternal parent may be different. So a dam is heterozygous for that gene. This means that the ancestors of this possible animal
is to receive one of these two different alleles from this parent.
In other words:
A homozygous is a person who carries two copies of the same allele at the same gene locus, for example ee or EE.
A heterozygote is an individual who carries two distinct alleles at a gene locus, for example Ee.
For a given gene we can distinguish three different genotypes: for example Ee, EE or ee.
These allelic combinations may produce different phenotypes. Suppose E is responsible for the production of eomelanin protein in the skin cells of dogs, which produces a black pigment in the skin, and e is responsible for the production of phaeomelanin in the skin cells of dogs, which produces a red pigment in the skin. Clearly, animals with the EE allele will be black and animals with the ee allele
They will be red. But what color will the dogs with the Ee allele be? This shows that they will also be black! This phenomenon is called dominance: the expression of allele e in the heterozygous state in the phenotype
They are not stated. The E allele is more dominant than the e or from one point of view of the e allele: that it is recessive to the E allele.
Breeding programs should not only be evaluated for genetic improvement, but also for inbreeding. Inbreeding becomes important among related animals when there is a genetic relationship increasing from zero at the time of crossing. Because their offspring will be of the same blood. And as we have seen, the coefficient of inbreeding is equal to half of the additive genetic connection of the parents. Inbreeding may result in the expression of recessive monogenic abnormalities and inbreeding pressure. Inbreeding occurs at most gene loci in homozygosity, so desirable dominant effects disappear. In this case, inbreeding has an opposite effect in relation to mixing. As we have seen, interbreeding leads to heterosis, especially in health and fitness traits. Also signs of hypertension
There are higher for these attributes as well.
This post is written by E_S_S_E_S