goglfollow.blogg.se - Dominant traits and recessive traits

This stronger allele is responsible for the dominant trait.

Dominant traits: When alleles combine together, some become stronger than the others.

Traits are alleles that help in the formation of chromosomes and fall into two categories: dominant traits and recessive traits. Phenotype consists of traits that influence the appearance and behavior of a person. Hitchhiker's thumb is not to be considered as a genetic condition or disorder, but is a result of the phenotype. The group of genes that is responsible for a trait is known as a genotype, with the characteristic of that particular trait called a phenotype.

McDonald, University of Delaware Phenotype Image Credit: Myths of Human Genetics John H. Thumbs ranging from straight to hitchhiker. It all depends on what allele people receive from their parents. One allele from the bendy thumb gene can produce a straight thumb and another allele may produce a hitchhiker's thumb. The gene that controls the extendibility of the thumb is known as the "Bendy thumb gene." The bendy thumb gene comprises of multiple alleles in the chromosomes. In the human genetic pattern, there are a number of genes that determine the size, shape, and color of a person. This type of bending does not affect the functions of the thumb nor causes any pain to it.

Having a hitchhiker's thumb is neither an advantage nor a disadvantage. When the distal joint hyperextends, it enables the thumb to bend backward, creating the hitchhiker's thumb. The distal joint plays an important role in keeping the thumb straight. This is because of the genetic traits that make a person bend his thumb backward while stretching. Hitchhiker's thumb is otherwise known as distal hyperextensibility of the thumb.