Genetic Factors:Genetic factors are inherited traits passed down from parents to offspring through genes. They can contribute to phenotypic variations by influencing an individual's physical characteristics or predisposition to certain behaviors.
Environmental Factors:Environmental factors include external influences such as nutrition, exposure to toxins, social interactions, and cultural experiences. These factors can also contribute to phenotypic variations by shaping an individual's development and behavior.
Gene Expression: Gene expression is the process by which information from a gene is used to create functional products such as proteins. Variations in gene expression can lead to differences in phenotype among siblings even if they have similar genetic makeup.