1362-CH-12-16--Quest_39840

1362-CH-12-16--Quest_39840 - Questions on Mitosis, Meiosis,...

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Unformatted text preview: Questions on Mitosis, Meiosis, Chromosomes, Genetics and DNA To Be Covered During Lecture I. What are the products of mitosis? 1. How many cells are produced at the end of a single mitotic division? 2. How many different kinds of cells are produced at the end of a single mitotic division? II. Six centromeres are observed in a prophase cell from a species of insect. 3. How many pairs of chromosomes does this organism contain? 4. For each stage of mitosis, indicate the number of centromeres you would expect to find and the number of copies of chromosomes attached to each centromere. Number of centromeres Number of chromosomes Stage of mitosis: visible per cell attached to each centromere Metaphase Anaphase III. Haplopappus is an annual flowering plant that grows in deserts. It is of interest because its 2n number is only four. 5. This means that cells in the vegetative parts of the plant, that are not undergoing mitosis, have how many DNA molecules in their nuclei? 6. During metaphase of mitosis, how many DNA molecules would be in the nucleus? 7. You have isolated DNA from three different cell types of an organism, determined the relative DNA content for each type, and plotted the results on the graph shown. A. Which sample of DNA might be from a nerve cell arrested in G0 of the cell cycle? B. Which sample might represent an animal cell in G2 phase of the cell cycle? C. Which sample might represent a sperm cell? 8. Somatic cells of a camel have 70 chromosomes. A. How many chromatids are present during Anaphase I? B. How many chromatids during Metaphase II? In meiosis II, cells now possess the haploid # (i.e., 35). C. How many tetrads during Prophase II? D. How many chromosomes in a camel skin cell? E. How many chromatids during Metaphase? F. Haploid gametes can undergo meiosis. T or F? 2 9. Referring to the labeled chromosomes below, of the given choices, which areas (A thru X) contain identical information? A. A & B B. A & C C. A & E D. A & W Referring to the chromosomes above, which areas contain similar information inherited from different parents? A. A & B B. A & C C. A & E D. A & W E. A & G Test your knowledge of the Law of Segregation: A. How many loci in AABbCC genotype? B. How many different gamete types would be formed? Carnosinemia is a metabolic disorder and is an autosomal recessive trait. Parents Mike & Jane have a normal phenotype, but produced 2 children having carnosinemia. What is the probability that they will have another affected child? Huntington’s disease is inherited as a dominant trait. A. What is the genotype of an unaffected individual? B. What is the phenotype of a heterozygote? C. What is the probability of having a normal child from a normal mother and a heterozygous father? Provide a genetic model explaining the data in the following experiment: A. Cross 1: Red‐eyed mouse x White‐eyed mouse gives the following F1 offspring: all red‐eyed mice B. Cross 2: Red‐eyed F1 x Red‐eyed F1 gives the following F2 offspring: 36 red‐eyed mice & 13 white‐eyed mice C. Include in your model: # genes & alleles involved; state which phenotype is dominant & which is recessive; indicate all genotypes with appropriate letter symbols 15. Provide a genetic model explaining the data in the following experiment: A. Cross 1: Long‐eared mouse x Short‐eared mouse gives the following F1 offspring: 12 long‐eared mice and 10 short‐eared mice B. Cross 2: Long‐eared F1 x Long‐eared F1 gives the following F2 offspring: 34 long‐eared mice and 14 short‐eared mice C. Include in your model: # genes & alleles involved; state which phenotype is dominant & which is recessive; indicate all genotypes with appropriate letter symbols 10. 11. 12. 13. 14. 3 16. Achondroplasia is a form of dwarfism controlled by one gene with 2 alleles. 2 achondroplastic dwarfs marry and have a dwarf child and later have a child which is of normal size. Based on this: A. Is achondroplasia a recessive or dominant phenotype? B. What are the genotypes of the 2 parents? 17. In the pedigree to the right, is the trait expressed by the shaded individuals inherited as a dominant or recessive trait? (or are both possibilities?) A. What are the genotypes of the following individuals? • • • • A: B: C: D: 18. In the pedigree to the right, is the trait expressed by the shaded individuals inherited as a dominant or recessive trait? (or are both possibilities?) A. What are the genotypes of the following individuals? o A: o B: o C: o D: 19. White eyes are a recessive sex‐linked trait in fruit flies. The normal eye color is red. If a white‐eyed female fruit fly is mated to a red eyed male, their offspring would be…? 20. Color blindness is a sex‐linked recessive trait. What are the genotypes of individuals A‐F in the following pedigree? A: B: C: D: E: F: 21. A certain (hypothetical) organism is diploid, has either blue or orange wings as the consequence of one of its genes, and has either long or short antennae as the result of a second gene, as shown in the figure below. A female with a paternal set of one orange and one long gene chromosomes and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis? 4 A. Only blue gene eggs B. Only orange gene eggs C. ½ blue and ½ orange gene eggs D. ¾ blue and ¼ orange gene eggs E. An intermediate frequency of blue and orange gene eggs 22. A mouse has the genotype aa for a specific trait. Which of the following statements in A‐D is incorrect regarding this individual? a) each parent of this mouse must have at least one copy of the a allele. b) all of the gametes produced by this mouse will have an a allele. c) there is a 100% probability that the offspring of this mouse will have the a allele. d) the aa phenotype would always represent the one that occurs at the lowest frequency in the mouse population. e) All statements in A‐D are correct; none are false. 23. A dominant allele K is necessary for normal hearing. A dominant allele M on a different locus results in deafness no matter what other alleles are present (what do you call this?). If a kkMm individual is crossed with a Kkmm individual, what percentage of the offspring will be deaf? A) 0 B) 25 C) 50 D) 75 E) None of the above 24. Which sequence is complimentary to the following DNA sequence? 5’ – A A G T A C – 3’ a. 5’ – A A G T A C – 3’ b. 5’ – T T C A T G – 3’ c. 5’ – G T A C T T ‐3’ 25. Properly draw leading & lagging strands in the diagram below. a. Which quadrant(s) (A, B, C, D): • • initially contains Okazaki fragments? initiates synthesis from an RNA primer? ...
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This note was uploaded on 04/23/2010 for the course BIOL 1361 taught by Professor Knapp during the Spring '05 term at University of Houston.

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