JAMB - Biology (2005 - No. 45)

When a yellow maize is crossed with a white maize and only yellow maize is produced in the first filial generation, the white trait is said to exhibit recessiveness because recessive trait will only be expressed if an maize offspring inherits two copies of the recessive allele. In this case, the white trait is not expressed even though it is there but it is silenced by the dominant trait which is yellow. The reason yellow maize( dominant) was expressed.