What is the difference between an allele a gene and a locus

What are genotypes? How do you write the heterozygous dominant genotype? What is a heterozygous genotype? What is a homozygous dominant genotype? How does dna relate to genes and alleles?

Impact of this question views around the world. You can reuse this answer Creative Commons License. Most chromosomes consist of two arms, which are connected by the centromere. The long arm of the chromosome is called the q arm, and the short arm is called the p arm. Giemsa banding or G-banding is the technique used to stain the condensed regions of the chromosomes. Figure 2: Different Loci on the Human Chromosome The G-banding technique can be used to identify chromosomes since each chromosome exhibit a unique banding pattern with the Giemsa stain.

The less condensed areas that are not stained by the Giemsa stain are the active genes. For example, the gene OCA1 is located on the 11q1.

This means the gene is located on the long arm of the chromosome 11 and between the sub-band4 of band 1to the sub-band 1 of band 2. For example, the end of the long arm of the chromosome 2 is labeled as 2qtel. The different loci of the human chromosome 11 are shown in figure 2.

Allele: An allele is an alternative form of a gene that is arisen by mutations and is found in the same locus of the homologous chromosomes. Locus: A locus refers to the position of an allele on the chromosome. Allele: Allele is a nucleotide sequence of a gene. Allele: A gene may contain two or more alleles.

Locus: One locus of the homologous chromosome pair may contain one or two alleles. Allele: Alleles are responsible for variable traits within a population. When an organism is heterozygous at a specific locus and carries one dominant and one recessive allele, the organism will express the dominant phenotype. Alleles can also refer to minor DNA sequence variations between alleles that do not necessarily influence the gene's phenotype. Further Exploration Concept Links for further exploration gene recessive dominant test cross genotype phenotype haplotype DNA chromosome Hardy-Weinberg equilibrium evolution mutation speciation penetrance SNP allele frequency Hardy-Weinberg equation population bottleneck principle of segregation principle of independent assortment dihybrid cross genetic drift lethal allele principle of uniformity Principles of Inheritance.

Related Concepts The specific location of a gene in the chromosome is also very important, and we call it a locus. Overview and Key Difference 2. What is an Allele 3. What is a Locus 4.

Similarities Between Allele and Locus 5. An allele is an alternative form of a gene. In simple words, alleles refer to different versions of a gene. There are often two alleles of one gene. But it can vary. More than two alleles may be present in genes. However, they located at the same location as the homologous chromosomes which calls locus. The DNA sequence or the nucleotide sequence differs between alleles of the same gene due to mutations.

This leads to different observable phenotypic traits as well as genetic disorders.