Name______________________________________________ ID #____________________________Biology 240, GeneticsQuiz – 4, week of Sep 29.0.5 pts per question. Total points = 10Q.1 How many Barr bodies are found in 49,XXXXY individuals in humans?a) 4.b) 3.c) 0.d) The number is variable.Q.2 Turner syndrome may arise due to non-disjunction during:a) Meiosis-1 only in mother.b) Meiosis-2 only in father.c) Meiosis-2 in any parent.d) None of the above.Q.3 Which of the following karyotypes may give rise to Klinefelter syndrome?a) 45, XO.b) 46, XX.c) 46, XY.d) 48, XXXY.Q.4 SRY gene is responsible for:a) Testis development in humans and Drosophila.b) Testis development in humans.c) Both testis and ovary development in humans.d) Ovary development in humans.Q.5 In mice, 2A, XX embryos carrying Sry gene:a) Have testes.b) Have ovaries.c) Show both male and female features.d) Develop as normal females.Q.6 In Drosophila, XXY, 2A embryos develop as:a) Normal male.b) Intersex.c) Metamale.d) Normal female.Q.7 In female mammals, only one of the two X chromosomes:a) Is eliminated from the nucleus.b) Has Xic.c) Transcribes the Xist gened) Becomes transcriptionally hyperactive.Name______________________________________________ ID #____________________________Q.8 In mouse, an autosome carrying Xic:a) Becomes inactivated.b) Blocks XX pairing.c) Blocks XY pairing.d) Both a and b are correct.Q.9 In Drosophila, the dosage compensation complex (DCC):a) Increases the X-linked gene expression in males only.b) Increases the X-linked gene expression in both sexes.c) Inactivates one of the two X chromosomes in females.d) Helps in testis development.Q.10 Turner syndrome is an example of:a) Monosomy.b) Aneuploidy.c) Both a and b are correct.d) Trisomy.Q.11 Down syndrome patients have threea) Sets of autosomes.b) Copies of chromosome 21.c) X chromosomes.d) Chromosome 13.Q.12 Non-disjunction during meiosis-1 causes:a) Monosomy and trisomy in the progeny.b) Aneuploidy only in sons.c) Aneuploidy only in daughters.d) None of the above.Q.13 In humans, 14/21 translocation increases the chance of:a) Patau syndrome.b) Klinefelter syndrome.c) Familial Down syndrome.d) Abnormal sexual phenotype.Q.14 At what wavelength of UV DNA shows maximum absorption?a) 280 nm.b) 250 nm.c) 260 nm.d) Both 260 and 280 nm.Q.15 If a double-stranded DNA is heated to 950,a) DNA will renature.b) Absorbance at 280 nm will increase.c) DNA will melt.d) DNA will breakdown into nucleotides.Name______________________________________________ ID #____________________________Q.16 A nucleoside is made of:a) Nitrogenous base and pentose sugar.b) Nitrogenous base, pentose sugar and phosphate.c) Pentose sugar and phosphates.d) None of the above.Q.17 Which of the following statements is true?a) RNA has adenine but DNA does not.b) Two strands of DNA molecule have the same polarity.c) In DNA A+T/G+C = 1.d) In DNA A+G/T+C = 1.Q.18 Each strand of a DNA double helix:a) Has the same number of purines and pyrimidines.b) Has the same number of adenine and thymine.c) Is made of polynucleotides.d) Is made of polynucleosides.Q.19 In DNA, two consecutive nucleotides are joined by:a) Hydrogen bonds.b) Phosphodiester bonds.c) Ionic bonds.d) Glycosidic bonds.Q.20 Which of the following statements is true? a) Number of uracil and adenine is same in DNA.b) Two strands of DNA are held together by hydrogen bonds.c) Purines are complementary to purines.d) RNA lacks
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