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.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c