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samplemt1 - 1 Genes a b and c have been identified as...

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1 . Genes a , b and c have been identified as belonging to the same linkage group. An individual heterozygous for all three genes is used in a test cross to a triple recessive individual. The following phenotypes are observed in the progeny of the test cross: +bc 330 a+c 65 ab+ 95 +++ 5 a++ 335 +b+ 70 ++c 90 abc 10 1000 From the data shown, what is the genotype of the heterozygous individual? (2 pts.) From this data, what percentage of progeny is the result of double crossovers during meiosis? Circle the correct answer below. (2 pts.) ( a .) 1.5 (b.) 15 (c.) 9 (d.) 24 (e.) None of the above What is the gene order for these three loci? Circle the correct answer. (3 pts.) (a.) b c a ( b.) b a c (c.) a b c (d.) a c b (e.) None of the above
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Name ____________________________________________ 1 What is the genetic distance (in map units) between the loci a-b and b-c. Circle the correct answer. (4 pts.) (a.) 15 and 20 (b.) 20 and 15 (c.) 20 and 35 (d.) 35 and 20 (e.) None of the above From the data shown above, what is the coefficient of coincidence? Circle the correct answer below. (3 pts.) ( a .) 0.5 (b.) 0.75 (c.) 1.0 (d.) 1.5 (e.) None of the above From the coefficient of coincidence you just calculated, indicate the type of interference by circling the correct answer below. (2 pts.) (a.) absolute (b.) partial (c.) zero (none) (d.) negative (e.) None of the above
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Name ____________________________________________ 2 2. The table below shows the composition of the eukaryotic nucleosome. From this information answer the following questions. (+ and - refer to positively and negatively charged amino acids) CHARACTERISTICS OF THE EUKARYOTIC NUCLEOSOME Histone +/- Amino Acid Ratio Molecular Weight H2A 1.4 14kD H2B 1.7 14kD H3 1.8 15kD H4 2.5 11.3kD H1 5.4 24kD (a). What is the molecular weight of the histone core (without DNA)? (2 pts.) (b). Which of the above proteins has the highest affinity to DNA? (2 pts.) (c). The interactions between the histones and DNA involve which of the following interactions? (Circle the correct answer). (2 pts.) Ionic bond Covalent bond (d). Chromatin is constantly condensing and decondensing.
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