These alleles result in four blood groups- A, B, AB, and O. There are 3 alleles for human blood groups, I A, I B and I O. A classic example of such an occurrence is the human blood group. Other factors like co-dominance and incomplete dominance also affect the expression of certain traits.Ĭo-dominance is the phenomenon wherein both the dominant and recessive allele expresses themselves in the same individual. These are also called the Mendelian inheritance as they follow the inheritance pattern as observed by Mendel in his inheritance experiments. Therefore, it will result in any of the two forms, with no intermediate results. These are those traits that are governed by a single gene, having two alleles. List of Dominant and Recessive Human Traits Single Gene Traits This can be deduced from the following table: Similarly, if the father is tall with genes “Tt” and mother is also tall with genes “Tt”, then their progenies will have the following genes – “TT” (tall), “Tt” (tall) and “tt” (dwarf). It can be deduced from the following table: In the same example, if we consider a father who is tall with genes “TT” and a mother who is dwarf with genes “tt”, then their progenies will have tall heights with genes “Tt”. And the gene for dwarfism will be “tt” (presence of two copies of the allele). If “T” is the allele for tall height and “t” is the allele for dwarfism, then the gene for tall height will be “TT” (presence of two copies of the same allele) or “Tt” (presence of one copy of the allele). Let us understand this by a simple example.
However, recessive traits are those that are expressed only when two copies of an allele are present in the gene. Dominant traits are those traits which are expressed even in the presence of one copy of an allele for a particular trait in the gene. The interaction between these alleles determines the expression of a gene. These two or more variations or forms of genes are called alleles. Thus, some of our physical traits are similar to our mother while some match with our father’s traits. These include one copy of the gene from the mother and one copy from the father. There are two copies of each gene present in an individual’s body with the exception of eggs and sperms. However, they do not just govern our outer appearance but other features like resistance to certain diseases, intolerance to certain chemicals, etc.
COMMON DOMINANT TRAITS SKIN
Such features include our height, skin color, eye color, hair texture, etc. These features are what makes us look the way we do.
COMMON DOMINANT TRAITS CODE
They code for specific proteins that are responsible for various physical features.
One of the most important principles that governs life is inheritance of genes. Such varied physical features that you like or dislike are a result of not only the corresponding genes but their expressions too! What are the Dominant and Recessive Traits? Human leukocyte antigen (HLA), that plays a crucial role in the immune response, is encoded by over 200 genes, having more than 300 alleles.Įnvious of your mom’s dimples which she unquestionably passed on to your sibling? Are you the proud owner of a pimple-free face just like your grandmother, when your sister frets about her oily skin? So you know, the genes for blue eyes is in your family (your dad has got one!), and it’s not you who have inherited but his niece.
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