BICD100mid1aans - 1 Draw and label the cell cycle and...

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1. Draw and label the cell cycle and briefly describe what happens in each step. What is interphase? Draw in at least one checkpoint and states its function. (5pts) Correct drawing 2.0pts brief description of each phase .5pt/each…interphase and checkpoint .5pt 2.Fruit flies are diploid organisms with 2n=8. Assuming no crossing over, how many gamete combinations are possible? 2pts a) 8 2 b) 2 4 c) 2 8 2 4 d) 8 2 e) 3 4 3. How many chromosomes and how many DNA molecules to you expect to see per cell for fruit fly cells in the following stages (4pts) Cell Stage Chromosomes DNA Molecules G 2 of interphase 8 16 Anaphase I of meiosis 8 16 Prophase II of meiosis 4 8 After cytokinesis following meiosis II 4 4 Assume that a diploid organism has 6 chromosomes for all of its somatic cells. 4. Draw the chromosome arrangement for a typical cell of this organism that is metaphase of mitosis (2pts) 6 duplicated chromosomes lines up at metaphase plate 1
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5. Now draw the chromosome arrangement of a cell from this organism at prophase I of meiosis (2pts) 3 tetrads randomly placed within cell 6. How many chromosomes are present in a human primary oocyte? a) 23 b) 46 c) 92 d) 69 e) 0 7. How many DNA molecules are present in secondary spermatocyte 8. Briefly describe the role of shugoshin and cohesin in meiosis. What would be the consequence if a genetic defect results in no production of shugoshin protein? (3pts) cohesin holds sister chromatids together and homologous chromosomes together at chiasmata During Anaphase I, centromeric cohesin protected by shugoshin During Anaphase II, shugoshin is degraded; centromeric cohesin is degraded and sister chromatids separate No shugoshin…improper separation of chromosomes 9. Albinism is a recessive trait (a) and is not sex-linked. An albino male and a female heterozygous for albinism want to have children. What are the phenotypic and genotypic ratios expected from this cross? 10. You find a collection of bunnies with either long or short ears. You assume that one gene pair is controlling the ear length. You perform several matings and get the following 2
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results (5pts) Parents Progeny Bunny#1,long X Bunny#2,short 1/2 long-eared bunnies; 1/2 short-eared bunnies Bunny#1,long X Bunny#3,long All long eared bunnies Bunny#2,short X Bunny#3,long 1/2 long-eared bunnies; 1/2 short-eared bunnies Bunny#1,long X Bunny#4,short 1/2 long-eared bunnies; 1/2 short-eared bunnies Bunny#2,short X Bunny#4,short 1/4 long-eared bunnies ;3/4 short-eared bunnies a)Which trait is dominant? Short b)Label the genotypes of all 4 bunnies CLARIFY WHAT SYMBOLS YOU’RE USING (what stands for what): S=short s=long for ex Bunny#1 ss Bunny#2 Ss Bunny#3 ss Bunny#4 Ss You have two parents that are each carriers (heterozygotes) for three separate autosomal recessive conditions. Assume that these genes sort independently from one another.
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