What is the specific gravity of a seawater?

1.025

Explanation:

Although the density of seawater varies at different points in the ocean, a good estimate of its density at the ocean's surface is 1025 kilogram per cubic meter. Its specific gravity is therefore 1.025.

see below

Explanation:

The specific gravity of surface seawater ranges from about 1.020 to 1.029

At the bottom of the oceans the specific gravity increases up to about 1.070

The colder the seawater the more dense.

The saltier the seawater the more dense.

The salilinty changes the specific gravity far more than the temperature does.

Tropical fresh water, like in Gatun Lake on the Panama Canal, has a specific gravity of only 0.9954

The Red Sea, hot, landlocked and arid has a specific gravity of about 1.029

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).