Question

Which allele is recessive?

Answer 1

An allele is one of two or more different versions of a gene variant. The ABO blood grouping system, for example, is regulated by the ABO gene, which has six common alleles.

Complete answer:
Each one of two or more genes that may occur alternately at a given location (locus) on a chromosome is referred to as an allele. Alleles can be found in pairs, or several alleles can influence the expression (phenotype) of a trait.

A genotype is the set of alleles that an individual possesses. If the paired alleles are identical, the organism's genotype is homozygous for that trait; if they are not, the organism's genotype is heterozygous for that trait. In a heterozygous pairing, a dominant allele will suppress the characteristics of a recessive allele.

However, in certain traits, alleles can be codominant, meaning that neither is dominant or recessive. The human ABO blood group system is an example; people with type AB blood have one A allele and one B allele. (People who have neither are known as type O.)

More than two alleles decide the majority of traits. Although there may be several forms of the allele, only two can bind to the designated gene site during meiosis. Furthermore, certain traits are influenced by two or more gene sites. Both options increase the number of alleles involved. Both genetic characteristics are the product of allele interactions.

A recessive allele is a form of genetic code that does not produce a phenotype in the presence of a dominant allele. The effects of the recessive allele are masked by the more drastic effects of the dominant allele in a dominant/recessive relationship between two alleles. A particular variant of a gene, or a specific portion of DNA, is known as an allele. Similar alleles make slightly different proteins with slightly different functions.

Recessive alleles have no effect unless the individual has two copies of the allele (also known as being homozygous). For example, since the allele for blue eyes is recessive, you must have two copies of the 'blue eye' allele to have blue eyes.Examples of Recessive alleles:Coat color , Tay-Sachs disease (Non-functioning alleles in the HEXA gene cause Tay-Sachs disease, which is a recessive disorder.)

Note: If the products of a dominant allele are unfavourable in the environment in which a population lives, natural selection will favour recessive alleles. Though genes only code for proteins, these proteins interact to construct and establish an organism's entire structure. When an enzyme isn't working, it may be more effective than having it.