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Across 3. Cell with two of each kind of chromosomes; is said to contain a diploid,or 2n, number of chromosomes 5. The name of the molecule that contains a genetic code 7. When there are two different alleles for a trait. 8. Observed trait of an organism that masks the recessive form of a trait. 11. When there are two identical alleles for a trait 12. Trait of an organism that can be masked by the dominant form of a trait. 13. Process is the cell nucleus where enzymes make an RNA copy of a DNA strand 15. Formed from DNA , contains many genes. 19. Type of cell division where one body cell produces four gametes, each containing half the number of chromosomes as a parent's body cell. 20. Male and female cells; sperm and eggs.

Down 1. Any change of or random error in a DNA sequence 2. Branch of biology that studies heredity. 4. Shape of a DNA molecule formed when two twisted DNA strands are coiled into a springlike structure and held together by hydrogen bonds between the base. 6. Combination of genes in an organism 9. In plants, the loss of water through leaf stomata by evaporation. 10. RNA that transports information from DNA in the nucleus to the cell's cytoplasm 14. Outward appearance of an organism, regardless of it's genes 16. Cell with one of each kind of chromosomes; is said to contain a haploid or n, number of chromosomes. 17. Period of nuclear cell division in wich two daughter cells are formed, each containing a complete set of chromosomes. 18. Alternative form of a gene for each variation of a trait of an organism.