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Across 5. nice 6. inside the universe 7. two alleles 10. space 12. groups of the family tree 14. Gratitude 17. atmosphere 18. the layout of a land mass 19. the chemical appearance of traits 20. happy 22. your moms moms mom 23. nerd 25. groups of a gene

Down 1. bye 2. depressed people 3. an archipelago ( country) 4. choke 6. report card making 8. large 9. the act of realization 10. the study of genes 11. Hill steepness 13. grateful 15. bird 16. spirit 18. report card 21. Fantastic 24. attain