Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
The phylogenetic tree of the OCTN homologs below was generated with the following accession numbers as the basis:
NP_957143.1 - OCTN of unknown function
CDM63451.1 - OCTN specific for ergothioneine transport
XP_021324939.1 - OCTN specific for carnitine transport
Which of the Salmo salar homologs has the most probable function as an ergothioneine transporter? Why?
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