1 . oxygen 3 a substance lacking in albino plants 2 . genes 7 thornless berries are a result of this 3 . hybrid 5 an albino plant dies as soon as these are gone 4 . nutrients 4 phosphate is attached to this in the DNA molecule 5 . chlorophyll 8 deoxy means to remove this 6 . each after their kind 10 the four bases in the DNA molecule of the cell 7 . blood vessels 9 the science of heredity proves this principle 8 . alphabet 13 DNA forms these 9 . giant molecules 12 DNA is the special life substance of these 10 . environment 1 albino people and animals have red eyes 11 . mutation 11 a word meaning the total surroundings of an organism 12 . sugar 2 offspring from a cross between two organisms differing in one or more genes 13 . purebred 6 an organism having the same genes for a certain trait