Dominant

In genetics, the term "dominant" is used to describe a gene (or certain characteristics of it) that are expressed in a person regardless of whether the alleles of that gene are the same or different. If the alleles are different, then the gene is considered recessive and its action in the human body is hidden.

Dominance is the ability of one of the alleles of a gene to exert its effect and mask the effect of another allele. The dominant allele completely suppresses the effect of the recessive allele in the heterozygote. Thus, the dominant gene determines the development of the trait regardless of the presence of the recessive allele.

Dominant: What does this mean in genetics?

Genetics is the science that studies the heredity and variability of organisms. One of the key concepts in genetics is gene dominance. A dominant gene describes a gene that is expressed in a person regardless of whether he or she has the same or different alleles for that gene.

Alleles are different versions of the same gene found on their respective chromosomes. If a person has inherited two copies of the same alleles of a gene, then he is homozygous. If he inherited two different alleles, then he is heterozygous.

If the dominant gene is in a heterozygous state, then it manifests itself because its action does not depend on the presence of other alleles. If the gene is in a homozygous state, then its dominance does not matter, since both copies of the gene are identical.

For example, the cornerstone of genetics is the gene on the autosome responsible for producing the pigment melanin in the skin. A person can have two versions of this gene: a high-activity version that results in dark skin, and a low-activity version that results in light skin. The highly active version is dominant and expresses itself regardless of the presence of other alleles.

On the other hand, if a gene is recessive, then its expression depends on the absence of a dominant gene. So, if a person has one copy of a dominant gene and one copy of a recessive gene, then he will only express the dominant gene. A recessive gene will only express itself if both copies of the gene are recessive.

In conclusion, a dominant gene describes a gene that is expressed regardless of whether the alleles of that gene are the same or different. This concept plays an important role in genetics, helping to understand how various characteristics of an organism are inherited.

Introduction

In genetics, the term "dominance" refers to the definition of the character of a gene that is expressed in an individual, regardless of that gene's alleles (the specific forms available for expression of the gene). When all alleles are identical, it means that the gene is recessive, including if it was simply not inherited, or if it was passed on once by each parent but is not clearly dominant. When an allele has the opposite meaning or the opposite trait, we can talk about a dominant allele.

Definition

The term dominant gene (D gene) refers to a gene or characteristic that can be expressed in an organism independent of other genes present in the organism's genotype. Genes on a chromosome can be either primary or accessory. Any gene can become a major gene, as well as a minor one, if necessary.

The main difference between a dominant gene and a recessive one is the degree of expression depending on the presence of the gene in the recessive. If a dominant gene is present in at least one part of the chromosome, then the trait will always appear in combination with the recessive part of the gene or its absence. Recessive genes may or may not be present at all on a particular chromosome to an equal extent, it all depends on the structure, expression of the gene and its definition in this capacity in the population.

People with two dominant alleles will have the desired effect, as will people with one recessive allele. However, if a person has different combinations of alleles, then the dominant allele is dominant. In this case, dominant genes become predominant in the regulation of phenotypic manifestation. Both different alleles will be weakly expressed even in people with a homozygous genome structure.

Dominant genes are associated with the interaction of alleles. The two alleles included in a domain will respectively represent “normal behavior” or “abnormal behavior.” Alleles