define dominant and recessive examples
Dominant and recessive are terms used in genetics to describe the inheritance of traits.
A dominant trait is one that is expressed in an individual who has only one copy of the gene for that trait. It masks the expression of a recessive trait when an individual has both dominant and recessive alleles for a particular gene. For example, in humans, the ability to taste a certain chemical called PTC is a dominant trait. If an individual has at least one dominant allele for the PTC taste gene, they will be able to taste PTC.
A recessive trait is one that is expressed only when an individual has two copies of the recessive allele for that trait. If an individual has one dominant allele and one recessive allele for a certain gene, the dominant trait will be expressed. For example, in humans, the ability to roll the tongue is a recessive trait. If an individual has two recessive alleles for this gene, they will be able to roll their tongue.