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1362-Questions--Ans_40705 - Questions from Exam 1 Review...

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Unformatted text preview: Questions from Exam 1 Review Session. Answers on last page. 1. A diploid cell in G1: has homologous chromosomes has replicated chromosomes has sister chromatids is about to divide into 2 cells none of AD apply to a cell in G1 2. Chromosome movements during mitosis or meiosis requires all the following except: A) microtubules B) centrosomes C) kinetochores D) highly condensed chromosomes E) There are no exceptions, AE are all required. 3. Which of the following is false of chromatids? They are replicated chromosomes joined together at the centromere. They are identical in mitotic chromosomes. If chromatids fail to separate during mitosis/meiosis, chromosomal aneuploidies can result. An unreplicated chromosome = 1 chromatid None of AD are false; they are all true statements. 4. The gametes of a red fox have 17 chromosomes. a) How many chromatids are present during metaphase I? b) How many replicated chromosomes in a telophase I cell? 5. Which is false concerning homologous chromosomes? a) They behave independently during mitosis b) They synapse during the prophase I of meiosis c) A diploid individual will have received one chromosome from each homologous chromosome pair from each parent. d) The sister chromatids of homologous pairs crossover during prophase I. 6. This cell represents: a) b) c) d) one in the process of forming gametes one in which the sister chromatids are genetically identical a haploid cell a mitotic phase a) b) c) d) e) a) b) c) d) e) 7. Two Martians fall in love & marry. One Martian is homozygous for red eyes and the other is heterozygous. The recessive eye color is purple. What is the probability that they will have a child with purple eyes? 2 8. In cocker spaniels, black color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If the offspring between BBss and bbss individuals are mated with each other, what fraction of their offspring will be expected to be black and spotted? Assume the genes are unlinked. 9. A certain medical condition is found in a family; the following pedigree shows the inheritance pattern of the disease (individuals that have the disease are indicated by shaded squares/circles). Determine the possible inheritance pattern(s) for this trait. (squares are males, circles are females) A) autosomal dominant trait B) autosomal recessive trait C) sexlinked recessive trait D) A,B, C are all possible E) Only A and C are possible. Match AF in the diagram with 19. 1. Okazaki fragments 2. Leading strand 3. DNA Ligase 4. Lagging strand 5. Template strand 6. RNA primer Properly draw leading & lagging strands in the diagram below. origin of replication 3' 5' Replication Replication Fork Fork 5' 3' 3 Answers: 1. A 2. E 3. D 4. 68; 34 5. D 6. A 7. 0% chance 8. Individuals of genotype BBss produces Bs gametes; genotype bbss produces bs gametes; crossing these yields all Bbss offspring (black and spotted). Mating these offspring, i.e., Bbss x Bbss: gametes for both are Bs, bs: Bs bs Bs BBss Bbss Offspring totals: Black & spotted = 75% (3/4) bs Bbss bbss Red & spotted = 25% (1/4) 9. D Matching: 1E; 2A; 3D; 4B; 5C; 6F Answer to replication bubble question origin of replication Leading Lagging 3' 5' Replication Replication Fork Fork 5' 3' Lagging Leading ...
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