216Inquiry into Life Laboratory Manual, 16th Edition ©2020 MaderExperimental Procedure: Wing Length and Body Color in DrosophilaIf your instructor has frozen flies available, cross out the numbers in Table 22.4 and use the stereomicroscopeor a hand lens to count the flies of each type given in Table 22.4. Otherwise simply use the data supplied foryou in Table 22.4.Table 22.4 Wing Length and Body Color in Drosophila*PhenotypesLongGrayLongEbonyShortShortPhenotypicGrayEbonyRatioNumber of offspring28322830Class data128120120120*Wings and body are understood in this table.Conclusions: Wing Length and Body Color in Drosophila• Calculate the actual phenotypic ratio based on the data and record in Table 22.4. Do the resultsdiffer from the expected ratio per individual data?.Per class data?Explain your answer.Two-Trait Genetics Problems1. In tomatoes, tall is dominant and short is recessive. Red fruit is dominant and yellow fruit is recessive.Choose a key for height bplant heterozygous for both traits?IR or tR Trfor color of fruit KrItRrWhat is the genotype of aWhat are the possible gametes for this plant?Using words, what are the likely parental genotypes if the results of a two-trait problem are 1:1:1:1among the offspring?3. In horses, black (B) and a trotting gait (T) are dominant, while brown (b) and a pacing gait (t) are reces-sive. If a black trotter (homozygous for both traits) is mated to a brown pacer, what phenotypic ratio isexpected among the offspring?4. Two black trotters have a brown pacer offspring. What is the genotype of all horses involved?black trotter parents Bb1bbrown pacer offspring bhtt5. The phenotypic ratio among the offspring for two corn plants producing purple and smooth kernels is9:3:3:1. (See page 284 of this lab for the key.) What is the genotype of these plants? parental plantsthe 9 offspring3 of the offspringthe other 3and the 1offspring?286Laboratory 22 Patterns of Inheritance22-10

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216 Inquiry into Life Laboratory Manual, 16th Edition ©2020 Mader Experimental Procedure: Wing Length and Body Color in Drosophila If your instructor has frozen flies available, cross out the numbers in Table 22.4 and use the stereomicroscope or a hand lens to count the flies of each type given in Table 22.4. Otherwise simply use the data supplied for you in Table 22.4. Table 22.4 Wing Length and Body Color in Drosophila* Phenotypes Long Gray Long Ebony Short Short Phenotypic Gray Ebony Ratio Number of offspring 28 32 28 30 Class data 128 120 120 120 *Wings and body are understood in this table. Conclusions: Wing Length and Body Color in Drosophila • Calculate the actual phenotypic ratio based on the data and record in Table 22.4. Do the results differ from the expected ratio per individual data?. Per class data? Explain your answer. Two-Trait Genetics Problems 1. In tomatoes, tall is dominant and short is recessive. Red fruit is dominant and yellow fruit is recessive. for color of fruit Kr ItRr Choose a key for height b plant heterozygous for both traits? IR br tR Tr What is the genotype of a What are the possible gametes for this plant? Using words, what are the likely parental genotypes if the results of a two-trait problem are 1:1:1:1 among the offspring? 3. In horses, black (B) and a trotting gait (T) are dominant, while brown (b) and a pacing gait (t) are reces- sive. If a black trotter (homozygous for both traits) is mated to a brown pacer, what phenotypic ratio is expected among the offspring? 4. Two black trotters have a brown pacer offspring. What is the genotype of all horses involved? black trotter parents brown pacer offspring bbtt 5. The phenotypic ratio among the offspring for two corn plants producing purple and smooth kernels is 9:3:3:1. (See page 284 of this lab for the key.) What is the genotype of these plants? parental plants the 9 offspring 3 of the offspring the other 3 and the 1 offspring? 286 Laboratory 22 Patterns of Inheritance 22-10