Changes

An '''allele''' is one of the variant forms of a [[gene]]. They produce variation in inherited characteristics such as hair color or blood type.  

An '''allele''' is one of the variant forms of a [[gene]]. They can produce variation in inherited characteristics such as hair color or blood type. However, most alleles don't have any effects. Individuals that are homozygous for an allele contain the same two copies, individuals that are heterozygous contain two different alleles for a gene.

In the case of simple inheritance, one form of the allele (the [[dominant gene]]) may be ''expressed'' more than another form (the [[recessive gene]]).

In the case of simple inheritance, one form of the allele (the [[dominant gene]]) may be ''expressed'' more than another form (the [[recessive gene]]) in heterozygous individuals.

<!-- To Do: Describe gene expression; dominant and recessive genes. -->

<!-- To Do: Describe gene expression; dominant and recessive genes. -->

[[Category:Genetics]]

[[Category:Genetics]]