A very important issue related to genetics and principles of inheritance of all traits are dominant alleles and recessive alleles. What is the difference between them and what are they actually?

Differences between alleles in genetics

An allel is one of the versions of a gene that has a specific locus on the chromosome. There can be more than one allele on the chromosome and often one feature is conditioned by two alleles, but it can also be conditioned by one. The male Y chromosome is empty and there is no allele on it. The combination of alleles can be heterozygous or homozygous.

The first means that on the chromosome there is both a dominant and a recessive allele of a given gene, while the homozygous combination means the appearance of two recessive alleles or only two dominant alleles. In a heterozygous juxtaposition, a feature conditioned by the dominant allele is revealed, because it has the so-called greater puncture force.

Sometimes it happens that a given attribute acts on the principle of supplementation and the so-called complement. It is called the complementary attribute, conditioned by the complementary gene. For example, a white flower and a red flower will give birth to a pink flower. A homozygous juxtaposition reveals a trait which is conditioned by a given allele and there is no such serious differentiation. Genetic diseases inherited are often conditioned by recessive alleles and in addition linked to sex. Then the disease reveals itself only in men and women are its carriers, which means that they have a gene determining the disease, but its symptoms do not appear in them.