SECTION 6,5 TRAITS AND PROBABILITY Study Guide KEY CONCEPT The inheritance of traits follows the rules of probabilÍty. monohybrid of ind e pendent assortment testc ross nnett square cross di cr0ss robability MAIN IDEA: Punnett squares illustrate genetic crosses. Identify what each of the numbered parts represents in the Punnett square below. Then draw lines from each of the parents' alleles to the corresponding alleles in the offspring. Aa A AA Aa f '.,'pnænfg,allele+, :, oenotvoe a. 3. a Aa possible genotypes of aa Why does each parent contribute only one allele to the offspring? > c o o E o Q C E c o MAIN IDEA: A monohybrid cross involves one trait. 5. You know a ratio is a comparison that tells how two or more things relate. What is a genotypic rutio? a phenotypic ratio? ro) f -o o tells the propoñion of offspring that have a particular phenotype .ts J õo) f o ô 6. What is the genotypic ratio of the offspring in Figure 6.15? C) o E .9 o 1'2.1 7. What is the phenotypic ratio of the offspring in Figure 6,15? o O Unit 3 Resource Book McDougal Liltell Biology Study Guide 17 Name Period Date STUDY GUIDE, CONTINUED MAIN IDEA: A dihybrid cross involves two traits. 8. What is a dihybrid cross? 9. ,: n ' ', , Why does eaoh parent organism in the F¡ géneration have four alleles listed in Figure 6.t7? akes 10. 3"lllferigsrÊ[ili".åi from this allele f had the'genotype AABb. what two types ôf gametes could resutt combination? iì 1. lVhat is the phenotypic ratio that results from a dihybrid cross between two organisms 6 . I 7 for help . that are heterozygous for both traits? See Figure MAIN IDEA: Heredity patterns can be calbutated rúitt p"onlbility. fZ. probäbilitypredictsthe' o,rorag",, numberôfoccurrences,notthe :numberofb-ccurrenceó: 13. To caloulate the probability that two independerrt events multiply the proþability 14. In Figure 6.18, the probability of getting tails up -o,f 1'" will happen together, each individual event, one coin that is heads up and one eoin that is * c 6 is one-for,rrth ct E o O : .s E Vocabulary Chêck co 15. What is a testcross? cE) = o I l6¡ 18 oenotvoe. What ís independent in the law study Guide =o F 2 assortment? Unit 3 Besource Book McDougal Littell Biology