récessifs

Récessifs is a term used in genetics to describe a form of gene expression. In diploid organisms, which have two copies of each gene, a recessive allele only manifests its traits when both copies of the gene are the recessive allele. If an individual has one dominant allele and one recessive allele for a particular gene, the trait associated with the dominant allele will be expressed, and the recessive trait will be masked. The recessive trait will only appear if the individual inherits the recessive allele from both parents. This concept is fundamental to understanding inheritance patterns and the expression of genetic variations. For example, in pea plants, the allele for wrinkled seeds is recessive to the allele for round seeds. A plant will only have wrinkled seeds if it inherits the wrinkled seed allele from both its mother and father. If it inherits one allele for round seeds and one for wrinkled seeds, it will have round seeds. The study of recessive traits helps explain why certain characteristics can skip generations and reappear in offspring.