To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a to make the check.
homozygous recessive
heterozygous dominant
homozygous dominant
purebred

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.