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Pcrlod Name sEcTt0f{ TRAITS, GENËS, AND ALLELËS 6.4 Study Guide KEY CONCEPT VOGABULARY Gene¡ encode protelns that produce a diverse range of g0n0 heterozygous phenotype allele gen0me dominant homozygous genotype recessive traits. MAIN IDEA¡ The same geue t. can have many verston¡. What is the relationship between a gerie and a protein? 2. What is an allele? env of the alternative formn of â trânê thal mav 3. rilhat at a soeclflc locus term describes a pair of alleles that are the same? that are different? homozvoous: heterozvoous 4. lVrite a definition of homologous chromosomes using the terms "gene" and "allele." Homologous chromosomes are two chromosomes, one from the mother and one from the father, that have the same length, overall appearanc€, and gones, although the alleles may dlffer. ïn the space belou draw a pair of homologous chromosomes. Label the ohromosomes with two sets of genes, one with homozygous alleles (Gene A, Gene A) and one with heterozygous alleles (Gene B, Gene b). cGt lmages should be similar to the Vlsual Vocab on pg, 180 in the textbook. Students will label Gene A, Gene A, gene B, and Gene b. o E ,q .ç E c o ct) o T =o) :E õ ôo(,) @ 'cc'l a Unit 3 Resource Book McDougal Litte ll Biology Study Guide 13 Name Pertod Date STUDY GUIDE, CONTINUED IUIAIN IDEA: Genes lnfluence the development of traits. 5, Write an analogy to show the difference between genot)?e and phenotype. Answers will Samole answer: oenotvoe ig the underlvino oonetics of an compared to someone's thoughts that you can't read. which could be 6. How are alleles represented on paper? as lFtters. uf'frercase for dominantSlleles and þwgfease for reses8jye allelqs 7. Fill in the table below with the missing genot'rye, phenotype (dominant or recessive), or alleles (TT, Tt, tt). Genotype homozygous dominant homozygous recessive heterozygous 8. If domlnant r0cessNe dominant Allelo¡ TT tt Tt an organism has a recessive trait, can you determine its genotype for that trait? Yes. it has to be 9. Phenotype recessive. What factors besides alleles affect phenotype? environment. such as n ic o o and sunsh¡n€ E o c) = E Vocabulary Gheck c o c 1O, What type of alleles are present in an organism with a QQ genotype? õ) f o f hnmnzvnar¡e r{nminanl õ ) .! 11. What is an alternative form of a gene? õo) J allala 12. What ôoo ã is the opposite of homozygous? of dominant? @ 3 ,cl ct o (J 14 Study Guide Unit 3 Resource Book McDougal Littell Biology