19Ì¡qtl, sEcÍ0N 6.4 TRAITS, GENES, AND ALLELES Study Guide KEY CONCEPT Genes encode proteins that produce a diverse range of traits. MAIN IDEA: The same LARY gene heterozygous phenotype allele gen0me dominant homozygous genotype recessive , gene can have many versions. 1. What is the relationship between a gene and a protein? 2. What is an allele? 3. What term describes a pair of alleles that are the same? that arc different? 4. Write a definition of homologous chromosomes using the terms "gene" and "allele." have the same length, overall appearance, and genes, although the alleles may differ. In the space below, draw a pair of homologous chromosomes. Label the chromosomes with two sets of genes, one with homozygous alleles (Gene A, Gene A) and one with heterozygous alleles (Gene B, Gene b). c> G o E o (J in the textbook. Students will labol Gene A, Gene A, gene B, .c and Gene b. lmages should be similar to the Visual Vocab on pg. 180 E ç o L o r= õ F '= õÞ' -o ôo @ c õ) À Unit 3 Besource Book McDougal Liltell Biology Study Guide 13 Name Period Date STUDY GUIDE, CONTINUED MAIN IDEA: Genes influence the development of traits. 5. Write an analogy to show the difference between genotype and phenotype. compared to someone's thoughts that you can't read. 6. How are alleles represented on paper? :. 7. Fill in the table below with the missing genotype, phenotype (dominant or recessive), or alleles (TT, Tt, tt). Phenotype Alleles dominant homozygous dominant homozygous recessive TT rec essive tt dominant 8. If an organism has a recessive 9. trait, can you determine its genotype for that trait? What factors besides alleles affect phenotype? tc a o Ë o O c E Vocabulary Gheck ç o 1O. What type of alleles are present in an organism with a QQ genotype? ,"bqn9uygglrs4ofl¡n¡rìt ,,. ll. ,,,,, . --- - -,, -;*". E CD f o -- :É o E J What is an altemative form of a gene? õol l allclp o ôo 12. What is the opposite of homozygous? of dominant? o r .o) o ()o 14 study Guide Unit 3 Resource Book It/cDougal Liltell Biology