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.
There are three versions (called âallelesâ) of this gene: A, B, and O. A personâs blood type is determined by which allele he/she inherits from each parent. The genetic constitution of an organism is called the âgenotypeâ.here are three versions (called âallelesâ) of this gene: A, B, and O. A personâs blood type is determined by which allele he/she inherits from each parent. The genetic constitution of an organism is called the âgenotypeâ.