Crossword Puzzle: DNA, Genetics, & Evolution, oh my!! Chapter 8 Lab Exercise, individual, 10 points Please review Chapters 5-8 of What is Life? A Guide to Biology before beginning this lab. The purpose of this lab exercise is to review terminology concerning DNA, genetics, and evolution. Note that the crossword puzzle has no blanks between words if there are several words in an answer. How to submit this exercise: You will need to print the crossword puzzle to mark answers and then submit the completed puzzle as either a picture file or PDF. Check the calendar for the closing date. Across 3. A change in allele frequencies of a population. 4. The genotype of a trait for which the two alleles are the same. 5. A trait controlled by a gene on a sex chromosome. 7. A sudden reduction in population size because of an event such as a famine that can lead to changes in the allele frequencies of a population. 15. Reproduction in which the offspring inherit their DNA from a single parent. 16. The molecule that is the product of transcription. It moves from the nucleus to the cytoplasm. 17. A process of nuclear division in humans that produces sperm and egg. 18. Division of a nucleus into two genetically identical nuclei that lead to the formation of two identical daughter cells. 19. An allele whose phenotypic effect is masked by a dominant allele for the trait. 20. Cells that will combine at fertilization to produce offspring called a reproductive cell. 22. A given trait increases fitness at one extreme of the phenotype and reduces fitness at the other, leading to an increase or decrease in the mean value of the trait. 23. The expression of the genes that an organism carries for a particular trait. 24. An allele that masks the phenotype effect of the other. 25. A strand of DNA on which are found specific sequences of base pairs that carry the information necessary for producing a protein. Down 1. A population’s organisms become better matched to their environment. 2. A diagram showing the possible outcomes of a cross between two individuals. 4. The genotype of a trait for which the two alleles an individual carries differ from each other. 6. Phase in the cell cycle during which the cell grows and functions. 8. The two identical strands of a replicated chromosome. 9. Division of the cytoplasm (cell) 10. An alternate version of a gene. 11. A group of organisms of the same species living in a particular geographic region. 12. The fusion of egg and sperm. 13. The genes that an organism carries for a particular trait. 14. Heritable variation for a trait occurs and individuals with one version of the trait have greater reproductive success than individuals with a different version of that trait. 21. Produces the greatest fitness at the intermediate point of the phenotypic range. 22. A given trait increases fitness at both extremes of the phenotype distribution and reduces fitness at middle values.