5. The cells of a multicellular organism, other than gametes and the germ cells from which it develops, are known as

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1 1. True or false? The chi square statistical test is used to determine how well the observed genetic data agree with the expectations derived from a hypothesis. True 2. True or false? Chromosomes in prokaryotic cells are usually in pairs. False 3. True or false? In mitosis, the chromosomes of different pairs undergo independent assortment because nonhomologous chromosomes move independently. False 4. The process of cell division that ensures that each of the two daughter cells receives a complement of chromosomes identical with the complement of the parent cell is known as A. meiosis. B. metaphase. C. mitosis. D. non disjunction. E. telophase. 5. The cells of a multicellular organism, other than gametes and the germ cells from which it develops, are known as A. germ cells. B. haploid cells. C. maternal cells. D. somatic cells. 6. The chromatids in a pair of chromosomes are held together at a specific region of the chromosome called the A. centromere. B. mitotic spindle. C. centrosome. D. chromosome binding site. 7. The portion of late interphase during which the chromosomes are replicated is called A. G1. B. G2. C. S. D. M. E. prophase. 8. A cell with a nucleus containing only one set of chromosomes, consisting of one member of each homologous pair, is A. diploid. B. haploid. C. somatic cell. Page 1

2 D. germ cell. E. both B and D 9. Each chromosome replicates to produce two sister chromatids in A. anaphase. B. interphase. C. meiosis. D. telophase 11. The centromeres divide longitudinally and the two sister chromatids move toward opposite poles in A. anaphase. B. metaphase. C. prophase. D. interphase. E. telophase. 12. The nuclear envelope forms around each group of chromosomes and the spindle apparatus disappears in A. metaphase. B. prophase. C. anaphase. D. telophase. 13. The mitotic phase in which the chromosomes are located at the central plate of the spindle is called A. anaphase. B. telophase. C. interphase. D. metaphase. E. prophase. 14. The mode of cell division which results in four daughter cells that are genetically different, with each cell containing one haploid set of chromosomes, is known as A. mitosis. B. cell division. C. meiosis. D. interphase. E. somatic cell regeneration. 15. Meiosis consists of how many successive nuclear divisions? A. one B. three Page 2

3 C. four D. two E. none 16. Humans have pairs of chromosomes. A. 46 B. 23 C. 28 D. 10 E In animals, meiosis takes place in a specific cell type called A. meiocytes. B. somatic cells. C. developmental cells. D. sperm cells. E. body cells. 19. Synapsis of homologous chromosomes occurs in A. the second meiotic division. B. zygotene. C. prophase II. D. pachytene. E. diakinesis. 20. The centromeres of sister chromatids uncouple and chromatids separate in which meiotic phase? A. prophase I B. anaphase I C. metaphase II D. telophase I E. anaphase II 21. A genetically important event called crossing over occurs during A. prophase I. B. anaphase I. C. telophase I. D. metaphase II. E. telophase II. 22. Which of the following results from a physical exchange between chromatids of homologous chromosomes? A. bivalent Page 3

4 B. meiotic division C. chiasma D. tetrad E. synapsis 23. In which of the following situations can the result of segregation be observed phenotypically? A. in the haploid products of meiosis or the cells derived from them by mitosis, provided that these can grow and divide (as in certain fungi). B. in the testcross progeny of a heterozygous diploid organism. C. in the F2 progeny of genetically different diploid parents. D. A, B and C. E. A and B 24. is an example of an X linked pattern of inheritance. A. Cerebral palsy B. Albinism C. Hemophilia D. Skin cancer E. Down's Syndrome 25. The probability that all children in a four child family will be males is A. 1/2. B. 1/4. C. 1/8. D. 1/16. E. 1/ Cytokinesis is the process in which the cell itself divides to yield two daughter cells. 27. Mitosis is conventionally divided into four stages known as prophase, metaphase, anaphase and telophase. 28. In anaphase, the centromeres divide longitudinally and the sister chromatids of each chromosome move toward opposite poles of the spindle. 29. Chromosomes that pair in meiosis and have the same genetic loci and structure are said to be homologous. 30. Prophase I is a long meiotic stage lasting several days in most higher eukaryotes and is commonly divided into five substages. 31. In mammals, the female is called the homogametic sex because only one type of gamete (X bearing) is produced. Page 4

5 32. X and Y chromosomes are called sex chromosomes to distinguish them from the other pairs of chromosomes, which are called autosomes. 33. Hemophilia A is a blood clotting disorder caused by a recessive allele with an X linked pattern of inheritance. 34. Nondisjunction is the occasional failure of two chromosomes to separate from each other during meiosis. 35. A conventional measure of goodness of fit between a set of observed numbers and theoretical expectations is known as chi square. 36. The triangular configuration of integers in which the nth row gives the binomial coefficients in the expansion of (x + y)(n 1) is known as Pascal s triangle. 37. The pairing of homologous chromosomes during meiosis is known as synapsis. 38. In mammals, the male is called the heterogametic sex because two different types of gametes (X bearing and Y bearing) are produced. 39. Reciprocal crosses resulting in different phenotypic ratios in the sexes often indicate X linked inheritance. 40. Thomas Hunt Morgan was the first geneticist to analyze the white eye mutation of Drosophila. Page 5

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