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Across 6. an organism that has different alleles at a particular gene locus (place on a chromosome) 8. the alleles for a particular trait (of an individual) 10. the sequence of these codes for a gene 11. the observable physical characteristics 12. a characteristic 15. an organism that has the same alleles at a particular gene locus (place on a chromosome) 17. an allele for which an organism must receive a copy from both parents in order to express the trait 19. a table used to work out the offspring produced 20. The chemical that chromosomes and genes are made of 21. the 23rd pair of chromosomes in a male

Down 1. an alternative form of a gene/ a representation of a gene 2. a section of a chromosome that codes for a trait 3. DNA 4. the number of bases 5. the number of chromosomes a human has 7. another word for children 9. the number of pairs of chromosomes a human has 13. this is made of sugar and phosphate molecules bonded together 14. allele which an organism must receive a copy from just one parent in order to express the trait 16. the 23rd pair of chromosomes in a female 18. a strand of DNA that is made up of thousands of genes.