Without enough thyroid hormone, metabolism slows, making weight gain more likely. Even a thyroid functioning at the lower end of the normal range might cause weight gain. Treating hypothyroidism with medication may reverse some of the weight gain. If you have any concerns, seek medical advice.
1 Allele: a different version of a gene. 2  Dominant: a trait that is visible and can cover up other traits when there is more than one present. 3  Genotype: the genetic makeup of an organism, or the versions of a gene that an organism has. 4  Heterozygous: having two different versions of a gene.
The term genetic characteristics can refer to a genotype, which is the specific DNA sequence that codes for a trait, or a phenotype, which is how the specific DNA sequence manifests itself in the organism -- often, but not always, the phenotype is how the organism looks.ome genetic characteristics exhibit complex inheritance patterns, meaning they appear as gradients instead of a feature that is either there or not. The gradient results from multiple genes that contribute to the characteristic.