Name__________________________________ ID#___________________________ Section #_____________________Bio 240 Quiz 1 (wk of Aug 24, 2014) With keyQ1 – Q 11 = multiple choie (0.5 pt each) = 5.5 pts; Q12 –Q14 = short answers = 4.5 pts. Total = 10 ptsQ1. The ant, Myrmecia pilosula, found in Australia has a single pair of chromosomes. In other words, 2n = 2. (Males are haploid and have just one chromosome.) Which of the following figures would most likely represent a correct configuration of chromosomes in a metaphase I cell of a female? (0.5 pts) (A) (B) (C) (D) (E)Q2. If a typical somatic cell has 64 chromosomes, how many chromosomes are expected in each gamete of that organism? (0.5 pts)A) 8B) 16C) 32D) 64E) 128Q3. In an organism with 52 chromosomes, how many bivalents would be expected to form during meiosis? (0.5 pts)A) 13B) 26C) 52D) 104E) 208Q4. For the purposes of this question, assume that a G1 somatic cell nucleus in a female Myrmecia pilosula contains 2 picograms of DNA. How much DNA would be expected in a metaphase I cell of a female? (0.5 pts)A) 16 picogramsB) 32 picogramsC) 8 picogramsD) 4 picogramsE) Not enough information is provided to answer the question.Q5. What is the outcome of synapsis, a significantevent in meiosis? (0.5 pts)A) side-by-side alignment of nonhomologous chromosomesB) dyad formationC) monad movement to opposite polesD) side-by-side alignment of homologous chromosomesE) chiasma segregation.Q6. During the S phase of the cell cycle, ________. (0.5 pts)A) DNA recombinesB) sister chromatids move to opposite polesC) the nuclear membrane disappearsD) RNA replicatesE) DNA content essentially doublesQ7. The accompanying sketch depicts a cell from an organism in which 2n = 2 and each chromosome is metacentric. Circle the correct stage for the cell in this sketch: (0.5 pts)A) anaphase of mitosisB) anaphase of meiosis IC) anaphase of meiosis IID) telophase of mitosisQ8. When cells withdraw from the continuous cell cycle and enter a "quiescent" phase, they are said to be in what stage? (0.5 pts)A) MetaphaseB) S-phaseC) G2 D) MitosisE) G0Q9. The horse (Equus caballus) has 32 pairs ofName__________________________________ ID#___________________________ Section #_____________________chromosomes, whereas the donkey (Equus asinus) has 31 pairs of chromosomes. How many chromosomes would be expected in thesomatic tissue of a mule, which is a hybrid of horse and donkey? (0.5 pts)A) 32B) 63C) 31D) 96E) 126Q10. Homologous chromosomes are found inA) All organisms.B) Haploids only.C) Diploids only.D) In testis and ovary cells.E) In animals only.Q11. Which of the following statements is correct? “A pair of homologous chromosomes A) Are genetically identical.B) Have alleles of the same set of genes.C) Have centromere at identical site.D) Are found in gametes.E) b and c are correct.Short Answer questionsQ12. Meiosis I is also called reductional division. Why? (1 pt)Because the daughter cells produced after meiosis I have half the number of chromosomes of the parental cell.Q13. What is the difference between haploid and diploid organisms? (1 pts)Haploids have one set of chromosomes; diploids have two sets of chromosomesQ14. An organism has two pairs of homologous chromosomes – A1A2 and B1B2. What would be the chromosome combination of the gametes produced by this organism? Write all possible combinations (2.5pts)Four combinations are expected:a) A1B1b) A1B2c) A2B1d)
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