An individual is the genotype Gg for a height trait. This individual is for that height trait.

This individual is heterozygous dominant for that height trait.

Explanation:

In Mendelian Genetics the letters in uppercase are for dominant traits and those in lower case are for recessive trait.

An individual has 2 alleles for a gene one from either parent. The dominant allele express the phenotype according to the law of dominance. Individual could be either heterozygous  that is both the dominant and recessive traits' allele are present in its gene or homozygous dominant in which both the alleles are dominant.

eg: GG (dominant homozygous)

 Gg  (Heterozygous dominant)

The individual with genotype Gg for a height will have dominant allele expressed which will mask the effect of recessive gene. The phenotype will be of dominant trait.

the correct answer is c   with the systems

the real answer is b. scintillation counter