Gases are constantly consumed and produced by cellular and metabolic reactions in most living things, so an efficient system for gas exchange between, ultimately, the interior of the cell(s) and the external environment is required. Small, particularly unicellular organisms, such as bacteria and protozoa, have a high surface-area to volume ratio.
Polyploid. (genetics) an organism or cell having more than twice the haploid number of chromosomes.Of a cell or organism having more than twice the haploid number of chromosomes; a polyploid cell; a polyploid species .Organisms that possess two sets of each chromosome.
When is Polyploidy useful. In: Entertainment âº Fine Art. Polyploidy:the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes Polyploidy allows the formation of new species derived from different ancestors.In1928 Karpechenko crossed a cabbage w/ a radish. Polyploidy allows the formation of new species derived from different ancestors.