phenotype
A gene can have multiple forms, which are called Alleles. While a single gene may code for a trait in an organism, when multiple alleles exist for that gene, each different may produce a different character of that trait. For example, a person has two copies of the gene that codes for ABO blood type. There are three different alleles for this gene, A, B and O. This results in six different combinations of the alleles that the person can have (the genotype), which in turn results in four expressions of the gene in the person (called the phenotype), which is the blood type of the person.
A gene can have multiple forms, which are called Alleles. While a single gene may code for a trait in an organism, when multiple alleles exist for that gene, each different may produce a different character of that trait. For example, a person has two copies of the gene that codes for ABO blood type. There are three different alleles for this gene, A, B and O. This results in six different combinations of the alleles that the person can have (the genotype), which in turn results in four expressions of the gene in the person (called the phenotype), which is the blood type of the person.
The DNA code for one hereditary trait is called a gene.
Sections of chromosomes that code for a trait are called genes.
A section of chromosomes that codes for a trait can be called
Homologous chromosomes.
A section of chromosomes that codes for a trait can be called
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The sections of DNA called codons code for amino acids.
Alleles represent the different forms of genes that code for a particular trait. Alleles can be dominant or recessive, and individuals inherit two alleles for each gene, one from each parent. These alleles determine the physical characteristics of an organism.
A change in the DNA code of an organism that results in a different trait than what is expected is called a mutation. Mutations can be caused by various factors such as environmental influences, errors during DNA replication, or exposure to radiation.
Polygenic inheritance occurs when a trait is controlled by two or more genes. Each gene contributes a small amount to the phenotype of the trait, resulting in a continuous range of phenotypic variations.