{"id":4547,"date":"2021-06-07T07:13:36","date_gmt":"2021-06-07T07:13:36","guid":{"rendered":"https:\/\/enorcerna.com\/wiki\/definition\/dominant-allele\/"},"modified":"2021-06-07T07:13:36","modified_gmt":"2021-06-07T07:13:36","slug":"dominant-allele","status":"publish","type":"post","link":"https:\/\/enorcerna.com\/wiki\/definition\/dominant-allele\/","title":{"rendered":"dominant allele"},"content":{"rendered":"
\n

\"DominantThe idea of allele<\/strong> refers to the value that each gene<\/strong> that, in a pair, occupies the same place in the chromosomes that are homologous. Dominant<\/strong>, on the other hand, it is an adjective that qualifies that or that which manages to dominate (that is to say, that is imposed).<\/p>\n

To define what is a dominant allele<\/strong>, we must understand what is dominance<\/strong> in the field of genetics. This concept refers to the link established by the alleles that are part of the same gene when one of these alleles manages to mask the manifestation of the phenotype of the other allele. The allele that manages to prevail is the dominant allele, while the other is the recessive allele<\/strong>.<\/p>\n

It is important to bear in mind that the dominant allele does not always play this role, in the same way that the recessive allele can become dominant in certain contexts. In this way, if the same gene<\/strong> it has more than two alleles, one allele can be dominant with respect to the second and recessive with respect to the third.<\/p>\n

A clear example of dominance, which has been used for a long time in the scientific field, is that of the shape of the seed<\/strong> pea (also known as chicharro<\/em> and scientific name pisum sativum<\/em>), since it is one of the traits that must be inherited from one generation to another and can be smooth and rounded, two characteristics provided by the dominant R allele, or wrinkled, if the recessive r allele triumphs.<\/p>\n

Although at first glance it may seem irrelevant, the study of peas by the Czech monk and naturalist Gregor Johann Mendel<\/strong> it revolutionized at the time the field of genetic inheritance, which arose from its well-known laws. Through the observation of the reproduction of these herbaceous plants belonging to the family Fabacea<\/em>, Mendel discovered many of the characteristics of the behavior of genes, and thus came to notice concepts such as the dominant or recessive allele, something that can also be appreciated in our species<\/strong>.<\/p>\n

\"DominantThe human being<\/strong>, most animals and certain plants are diploid organisms<\/strong> since they have pairs of chromosomes. Each of these chromosomes, in turn, has two versions called haploid: one developed by the father and the other by the mother. Homologous chromosomes have the same structure and genes as their corresponding counterpart, although with different manifestations (the alleles).<\/p>\n

The dominant alleles are those that, either appearing in a double dose or in a single dose, manage to prevail in the expression of certain features<\/strong> and, therefore, are manifested in the specific expression of the genotype (the genetic information) which is known as phenotype<\/strong>, for example through the color of the eyes, the characteristics of the hair or the type of nose and ears.<\/p>\n

In the specific case of the eyes, there is a clear definition of traits<\/strong> possible, both dominant and recessive. For example, brown eyes are known to represent a dominant trait over blues, greens, browns, and grays. With regard to vision, in a similar way, the good is dominant over any disorder that prevents the subject from seeing normally, such as night blindness, color blindness or myopia.<\/p>\n

Another aspect of human beings in which we can notice the presence of dominant and recessive alleles is hair color. Dark is dominant with respect to red and blonde, as well as curly (or curled<\/em>) dominates the hair<\/strong> straight. We must also point out that baldness is recessive, since the dominant feature is a head of hair that covers the entire scalp.<\/p>\n<\/p><\/div>\n\n\n

\n \n
\n \n
\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n <\/div>\n \n
\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n <\/div>\n<\/div>\n \n\n
\n Rate this post<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

The idea of allele refers to the value that each gene that,…<\/p>\n","protected":false},"author":1,"featured_media":4548,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-4547","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-definition"],"_links":{"self":[{"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/posts\/4547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/comments?post=4547"}],"version-history":[{"count":0,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/posts\/4547\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/media\/4548"}],"wp:attachment":[{"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/media?parent=4547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/categories?post=4547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enorcerna.com\/wiki\/wp-json\/wp\/v2\/tags?post=4547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}