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Download Chapter 4 Genetics: The Science of Heredity
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Name: Class: Date: Science Explorer Life Science Georgia Chapter 4 Genetics: The Science of Heredity Instructions: Complete the crossword puzzle. Use the clues to help identify the words. 1 4 2 3 5 6 7 9 8 10 11 12 13 14 15 16 Across 2. The scientific study of heredity. 5. An organism’s physical appearance, or visible traits. 6. ____ RNA: RNA that copies the coded message from DNA in the nucleus and carries the message into the cytoplasm. 7. The passing of traits from parents to offspring. 11. Having two identical alleles for a trait. 14. ____ RNA: RNA in the cytoplasm that carries an amino acid to the ribosome and adds it to the growing protein chain. 15. ____ square: A chart that shows all the possible combinations of alleles that can result from a genetic cross. 16. ____ allele: An allele that is masked when a dominant allele is present. Powered by PuzzleView, an FSCreations, Inc. product. Page 1 Down 1. The set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait. 2. An organism’s genetic makeup, or allele combinations. 3. A condition in which neither of two alleles of a gene is dominant or recessive. 4. Having two different alleles for a trait. 5. A number that describes how likely it is that an event will occur. 6. The process that occurs in the formation of sex cells (sperm and egg) by which the number of chromosomes is reduced by half. 8. A characteristic that an organism can pass on to its offspring through its genes. 9. The joining of a sperm and an egg. 10. ____ allele: An allele whose trait always shows up in the organism when the allele is present. 11. An organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait. 12. A change in a gene or chromosome. 13. The different forms of a gene. 15. The offspring of many generations that have the same traits. Powered by PuzzleView, an FSCreations, Inc. product. Page 2