the specific gravity of basalt will vary over a wide range, however because basalt is extruded from volcanoes and cools rapidly and may contain gases or pores, its specific gravity should be less than granite which is formed by slow cooling and has a large crystals and no pores. large crystal rocks generally have a higher specific gravity than fine crystal or amorphic rocks.
The outcome will be 25% homozygous dominant, 50% heterozygous, and 25% homozygous recessive. so a 75% chance they will have round seeds and a 25% chance they will have oval seeds.
