What is it called when you have two different genes?
An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.
What term is used for a gene that contributes to more than one phenotype?
The term pleiotropy is derived from the Greek words pleio, which means “many,” and tropic, which means “affecting.” Genes that affect multiple, apparently unrelated, phenotypes are thus called pleiotropic genes (Figure 1).
What does homozygosity mean?
Homozygous describes the genetic condition or the genetic state where an individual has inherited the same DNA sequence for a particular gene from both their biological mother and their biological father. It’s often used in the context of disease.
What is Hemizygosity?
(HEH-mee-ZY-gus) Describes an individual who has only one member of a chromosome pair or chromosome segment rather than the usual two. Hemizygosity is often used to describe X-linked genes in males who have only one X chromosome.
Is eye color an example of epistasis?
Although eye color is usually modeled as a simple, Mendelian trait, further research and observation has indicated that eye color does not follow the classical paths of inheritance. Eye color phenotypes demonstrate both epistasis and incomplete dominance.
What is a epistasis in genetics?
Epistasis is a circumstance where the expression of one gene is affected by the expression of one or more independently inherited genes. For example, if the expression of gene #2 depends on the expression of gene #1, but gene #1 becomes inactive, then the expression of gene #2 will not occur.
What pleiotropy means?
genetics. : the phenomenon of a single gene influencing two or more distinct phenotypic traits : the quality or state of being pleiotropic In genetics, there’s a concept called pleiotropy, which posits that a single gene can influence multiple traits. [