Alleles are different versions of the same gene that control the development of characteristics. A recessive allele is an allele that controls the development of characteristics only if the dominant allele is not present.
The name given to an allele which controls the development of a characteristic even when it is present on only one of the chromosomes is called a **dominant allele**.
Dominant alleles are expressed when they are present on one or both chromosomes in a pair. In contrast, recessive alleles are expressed only when they are present on both chromosomes in a pair.
Here are some websites that discuss What Name Is Given To An Allele Which Controls The Development Of A Characteristic Even When It Is Present On Only One Of The Chromosomes? that you might find useful:
1. [The Student Room](https://www.thestudentroom.co.uk/g/revision-tests/alleles)
2. [BBC Bitesize](https://www.bbc.co.uk/bitesize/guides/z2296yc/revision/1)
3. [Britannica](https://www.britannica.com/science/allele)
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