A sex-linked is any phenotypic trait associated with one or more genes located on sex chromosomes, i.e., on the X chromosome and/or the Y chromosome. In humans, females have two X chromosomes, whereas males have one X chromosome and one Y chromosome. In humans, sex-linked traits are often associated with recessive diseases caused by mutations on the X chromosome, although there are exceptions to this rule. In consequence, if a disease is associated with a mutation in the X chromosome, males will have more chances to be affected because males have a single copy of the X chromosome.
One significant difference that I noticed was the color of the water. In the control aquarium, the color of the water at 30 days was the same as it was on the 1st day. In the experimental aquarium, the water had a green tint on the 30th day, but on the first day it was clear.
