1	Children resemble their parents.
2	Genes come in pairs.
3	Genes don't blend.
4	Some genes are dominant.
5	Genetic inheritance follows rules.
6	Genes are real things.
7	All cells arise from pre-existing cells.
8	Sex cells have one set of chromosomes; body cells have two.
9	Specialized chromosomes determine gender.
10	Chromosomes carry genes.
11	Genes get shuffled when chromosomes exchange pieces.
12	Evolution begins with the inheritance of gene variations.
13	Mendelian laws apply to human beings.
14	Mendelian genetics cannot fully explain human health and behavior.
15	DNA and proteins are key molecules of the cell nucleus.
16	One gene makes one protein.
17	A gene is made of DNA.
18	Bacteria and viruses have DNA too.
19	The DNA molecule is shaped like a twisted ladder.
20	A half DNA ladder is a template for copying the whole.
21	RNA is an intermediary between DNA and protein.
22	DNA words are three letters long.
23	A gene is a discrete sequence of DNA nucleotides.
24	The RNA message is sometimes edited.
25	Some viruses store genetic information in RNA.
26	RNA was the first genetic molecule.
27	Mutations are changes in genetic information.
28	Some types of mutations are automatically repaired.
29	DNA is packaged in a chromosome.
30	Higher cells incorporate an ancient chromosome.
31	Some DNA does not encode protein.
32	Some DNA can jump.
33	Genes can be turned on and off.
34	Genes can be moved between species.
35	DNA responds to signals from outside the cell.
36	Different genes are active in different kinds of cells.
37	Master genes control basic body plans.
38	Development balances cell growth and death.
39	A genome is an entire set of genes.
40	Living things share common genes.
41	DNA is only the beginning for understanding the human genome.