Practice Problems GN 311.pdf - Practice Problems Exam...

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Practice Problems - Exam One (GN 311 - 601) 1) All of the following cells, shown in various stages of mitosis and meiosis, come from the same rare species of plant. a. What is the diploid number of chromosomes in this plant? b. Give the names of each state of mitosis or meiosis shown. c. Give the number of chromosomes and number of DNA molecules per cell present at each state. 2) How would each of the following events affect the outcome of mitosis or meiosis? a. Mitotic cohesin fails to form early in mitosis b. Shugoshin is absent during meiosis c. Shugoshin does not break down after anaphase I of meiosis
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d. Separase is defective 3) A cell in prophase II of meiosis contains 12 chromosomes. How many chromosomes would be present in a cell from the same organism if it were in prophase of mitosis? Prophase I of meiosis? 4) A cell has 8 chromosomes in G of interphase. Draw a picture of this cell with its chromosomes at the following stages. Indicate how many DNA molecules are present at each stage. a. Metaphase of Mitosis. c. Anaphase II of Meiosis b. Anaphase of Mitosis d. Diplotene of Meiosis I 5) A horse has 64 chromosomes and a donkey has 62 chromosomes. A cross between a female horse and a male donkey produces a mule, which is usually sterile. How many chromosomes does a mule have? Can you think of any reason for the fact that most mules are sterile?
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6) In cucumbers, orange fruit color (R) is dominant over cream fruit color (r). A cucumber plant homozygous for orange fruit is crossed with a plant homozygous for cream fruit. The F are intercrossed to produce the F . a. Give the genotypes and phenotypes of the plants, the F and F . b. Give the genotypes and phenotypes of the offspring of a backcross between the F and the orange-fruited parent. c. Give the genotypes and phenotypes of a backcross between the F and the cream-fruited parent 7) In cats, blood-type A results from an allele (I ) that is dominant over an allele (i ) that produces blood- type B. There is no O blood type. The blood types of male and female cats that were mated and the blood types of their kittens follow.
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