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Across 4. Observed trait of an organism that masks the recessive form of a trait. 8. Branch of biology that studies heredity. 9. Alternative form of a gene for each variation of a trait of an organism. 12. 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. 13. Male and female cells; sperm and eggs. 15. Process is the cell nucleus where enzymes make an RNA copy of a DNA strand 18. Formed from DNA , contains many genes. 19. When there are two identical alleles for a trait 20. Outward appearance of an organism, regardless of it's genes

Down 1. Cell with two of each kind of chromosomes; is said to contain a diploid,or 2n, number of chromosomes 2. Any change of or random error in a DNA sequence 3. Period of nuclear cell division in wich two daughter cells are formed, each containing a complete set of chromosomes. 5. In plants, the loss of water through leaf stomata by evaporation. 6. Cell with one of each kind of chromosomes; is said to contain a haploid or n, number of chromosomes. 7. The name of the molecule that contains a genetic code 10. RNA that transports information from DNA in the nucleus to the cell's cytoplasm 11. When there are two different alleles for a trait. 14. Trait of an organism that can be masked by the dominant form of a trait. 16. Combination of genes in an organism 17. Type of cell division where one body cell produces four gametes, each containing half the number of chromosomes as a parent's body cell.