With three sets of chromosomes in each cell, 3n.
Refers to organisms that possess three sets of chromosomes, instead of the normal two sets of chromosomes. Conversion of a diploid (i.e., two sets of chromosomes) organism to triploid can be done by man (e.g., certain fish, “seedless,” grapes, etc.). For example, fish are ordinarily diploid. By exposing fish eggs to certain specific combinations of temperature and pressure, immediately after fertilization of those eggs, scientists can cause the resultant fish to become triploid. Triploid fish are unable to reproduce. This sterility is desired by man, in order to prevent certain fish (e.g., those that have been genetically engineered) from mating with wild fish.
Such induced (triploid) sterility also prevents the (genetically engineered) fish from wasting energy on the act of reproduction, so they grow faster and larger. That transfer (of energy use from reproduction to growth) also holds true for “seedless” grapes, watermelons, etc.
An organism with three genomes or sets of chromosomes.
Referring to a cell where each chromosome, except the sex chromosome, occurs three times, which is not viable in humans.
To an organism or cell that has three complete sets of chromosomes, not the normal two. In humans, triploid fetuses are usually spontaneously aborted or stillborn; in the few cases of live birth, they are grossly deformed and die quickly.
Describing cells, tissues, or individuals in which there are three complete chromosome sets. Compare haploid, diploid.