1					2
		3								4									5
6
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					8
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		10
				11										12
13
	14
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16
								17

Across 4. not actually junk, but regulate the activity of protein-producing genes 8. quirk of meiosis where parts of chromosomes are exchanged in cell division 10. through learning and socialization, humans adjust to change and pass this on to future genereations 11. the cell produced by the union of sperm and egg, before it undergoes cleavage. 13. nature allows survival and reproduction in those members whose genes permit them to adapt to their environment 14. more usual process of cell division, resulting in each cell containing the same 46 chromosomes 15. threadlike bodies in the nucleus that are made up of genes 16. the genetic endowment that members of a species have in common 17. studied dark and light moths in highly industrialized area

Down 1. map of the sequence of the units (letters) that make up DNA 2. double helix sequence of A and C, also T and G 3. result of one fertilized ovum dividing into two genetically identical individuals 5. called dizygotic because two eggs are involved 6. the moment the egg is fertilized by the sperm 7. single female reproductive cell 9. any of several forms of a gene, usually arising through mutation, that are responsible for hereditary variation 12. process where sperm and ova conjugate, then split twice, resulting in each having only 23 chromosomes