Study Guide for Genetics Exam 1
Study Guide for Genetics Exam 1 BIO 22700
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This 5 page Study Guide was uploaded by Alycia Summers on Friday February 19, 2016. The Study Guide belongs to BIO 22700 at Ithaca College taught by Te-Wen Lo in Spring 2016. Since its upload, it has received 55 views. For similar materials see Genetics in Biology at Ithaca College.
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Date Created: 02/19/16
Study Guide for Genetics Exam 1 1. Genetically, how are prokaryotes different from eukaryotes? a. Prokaryotes usually have a single circular DNA b. Prokaryotes do not have histone proteins to package their DNA c. Prokaryotes do not have a nucleus d. All of the above 2. Where do kinetochores form and microtubules attach? a. Telomeres b. Nucleus c. Centromere d. Chromatid 3. How many pairs of chromosomes do humans have? a. 46 b. 23 c. 36 d. 22 4. How many sets of chromosomes do humans have? a. 1 b. 2 c. 3 d. 4 5. Diploid cells have a. Two chromosomes b. Two sets of chromosomes c. One set of chromosomes d. Two pairs of homologous chromosomes 6. What is the correct order of stages in the cell cycle? a. G1, S, prophase, metaphase, anaphase b. S, G1, prophase, metaphase, anaphase c. Prophase, S, G1, metaphase, anaphase d. S, G1, anaphase, prophase, metaphase 7. Which of the following takes place in meiosis II, but not in meiosis I? a. Crossing over b. Contraction of chromosomes c. Separation of homologous chromosomes d. Separation of chromatids. 8. A diploid organism possesses_____ alleles on different_____. a. Two, homologous chromatids b. Two, homologous chromosomes c. Three, homologous chromosomes d. Three, sister chromatids 9. How many different alleles can you have of a specific gene? a. 1 b. 2 c. 10 d. greater than 10 10. In what phase of meiosis does independent assortment occur? a. Prophase and metaphase b. Metaphase and anaphase c. Anaphase and telophase d. Telophase and cytokinesis 11. The probability of rolling two 5’s consecutively? a. 1/3 b. 1/6 c. 1/12 d. 1/36 12. The probability of rolling either a 1 or a 3 is? a. 1/3 b. ¼ c. 1/12 d. 1/36 13. 14. How would each of the following events affect the outcome of mitosis or meiosis? a. Mitoic cohesion fails to form early in mitosis. b. Shugoshin is absent during meiosis. c. Shugoshin does not break down after anaphase I of meiosis. d. Separase is defective. 15. A person who has one X and one Y chromosome that lacks the SRY gene would appear? a. Male b. Female 16. A person who has two X chromosomes and a function copy of the SRY gene would appear.. a. Male b. Female 17. You discover a new amphibian and name the sex chromosomes A and B. If the female is heterogametic and the male is homogametic, what would the arrangement of sex chromosomes be? a. Female AA and Male BB b. Female AB and Male AB c. Female AB and Male BB d. Female BB and Male AB 18. Would a person with Turner’s syndrome (XO) be male or female? a. Male b. Female 19. Would a person with Klienfelter’s Syndrome (XXY) be male or female? a. Male b. Female 20. Would a person with XXX Syndrome be male or female? a. Male b. Female 21. What would cause a white-eyed female to possess two X chromosomes and a Y chromosome (X X Y)? w a. Non-disjunction b. Crossing-over c. Recombination d. Cell death 22. Yellow (Y) is dominant to white (w). In a heterozygous cross, what would be the expected progeny? a. ¼ YY (yellow), ½ Yy (yellow), ¼ yy (white) b. ½ YY (yellow), ¼ Yy(yellow), ¼ yy (white) c. ¼ YY(yellow), ¾ Yy( yellow) d. ½ Yy (yellow), ½ yy (white) 23. What could explain an outcome of 2/3 progeny are yellow and 1/3 progeny are white? a. YY animals died b. Yy animals died c. Yy animals died 24. ABO Blood groups are an example of a. Codominance b. Incomplete dominance c. Variable penetrance d. Variable expressivity 25. 26. A certain species has three pairs of chromosomes: one acrocentric pair and two metacentric pairs. Draw a cell of this species as it would appear in the following stages of meiosis. a. Metaphase I b. Anaphase I c. Metaphase II d. Anaphase II 27. Can a complementation test be implemented for dominant mutations? a. Yes b. No 28. A fly embryo dies during early embryogenesis due to a recessive maternal effect allele called bicoid. The wild-type allele is designated bicoid +. What is the genotype and phenotype of the embryo’s mother? a. Bicoid – bicoid +, wild type b. Bicoid – bicoid -, wild type c. Bicoid + bicoid +, wild type d. Bicoid – bicoid +, bicoid 29. When might you see an autosomal dominant trait skip generations? a. A new mutation arises b. Variable penetrance c. Variable expressivity d. It becomes a recessive trait 30. If an allele for tall (T) is dominant to an allele for short (t), what proportion of the progeny will be tall in the following cross: Tt X TT? 31. Albinism is a recessive disorder in which the hair, eyes, and skin have no pigment. A couple who are both heterozygous for albinism wish to have kids. a. What is the probability of this couple having three kids with albinism? b. What is the probability of this couple having the first two kids with albinism and the third kid having pigmentation? 32. In mice, black coat color (B) is dominant over brown (b), and a solid pattern (S) is dominant over white spotted (s). Color and spotting are controlled by genes that sort independently. A homozygous black, spotted mouse is crossed with a homozygous brown, solid mouse. All of the F1 mice are black and solid. A testcross is then carried out by mating the F1 mice with a brown spotted mouse. a. Give the genotypes of the parents and the F1 mice. b. Give the genotypes and phenotypes, along with their expected ratios, of the progeny expected from the testcross. 33. In the California poppy, an allele for yellow flowers (C) is dominant over an allele for white flowers (c). At an independently assorting locus, an allele for entire petals (F) is dominant over an allele for fringed petals (f). A plat that is homozygous for yellow an entire petals is crossed with a plat that is white and fringed. A resulting F1 plat is then crossed with a plat that is white and fringed, and the following progeny are produced: 54 yellow and entire; 58 yellow and fringed; 53 white and entire; and 10 white and fringed. a. Use a chi-square test to compare the observed numbers with those expected for the cross. b. What conclusion can you make from the results of the chi- square test? c. Explain why this could be? 34. Sally has normal vision, but her mother is color blind. Bob is color blind. If Bob and Sally marry and have a child together, what is the probability that the child would be color blind? 35. Inheritance of alleles at the ABO locus can be illustrated by a paternity suit against Joe Schmoe. Joe met a young pretty girl named Joan and they had an affair. The affair ended in August of 1942, but many months later Joan gave birth to a baby and claimed that Joe was the father and tried to sue for child support. Joan, Joe, and Joan’s baby were all blood typed to find that Joan had a blood type A, her child had a blood type B and Joe had a blood type O. Could Joe Schmoe be the father of Joan’s father? 36. In chickens, comb shape is determined by alleles at two loci (R, r and P, p). A walnut comb is produced when at least one dominant allele R is present at one locus and at least one dominant allele P is present at a second locus (genotype R_ P_). A rose come is produced when at least one dominant allele is present at the first locus and two recessive alleles are present at the second locus ( genotype R_ pp). A pea comb is produced when two recessive alleles are present at the first locus and at least one dominant allele is present at the second (genotype rr P_). If two recessive alleles are present at the first and at the second locus (rr pp), a single comb is produced. Progeny with what types of combs and in what proportions will result from the following crosses? a. RRPP x rrpp b. RrPp X rrpp c. Rrpp X rrpp 37. A dog breeder liked yellow and brown Labrador retrievers. In an attempt to produce yellow and brown puppies, she mated a yellow Lab male and brown Lab female. Unfortunately, all the puppies produced in this cross were black. a. Explain this result? What was the genotype of the parents?
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