Chromosomes are thread-like structures located inside the nucleus of animal and plant cell.
A gene is the basic physical and functional unit of heredity which are made up of DNA.
A Trait is a distinct variant of a phenotype characteristic of an organism that may be inherited, be environmentally determined or be a combination of the two.
dominant and recessive describe the inheritance patterns of certain traits. That is, they describe how likely it is for a certain phenotype to pass from parent offspring.
Genotype is the genetic makeup of a cell, an organism, or an individual usually with reference to a specific characteristic.
Phenotype is the composite of an organism's observable characteristics or traits