Homework set 5 (Chap 2 and 3).docx - Konopka UA – General...

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Konopka UA – General Genetics – Summer 18 Name _________________________ Homework Set #5 – Chapters 2 and 3 – Due June 26 by end of day Part I: Complete the Sapling Ch2-3 Homework online. Part II: For each question, type out your answer beneath each question in a different font color. Upload this sheet with answers to the appropriate Assignment folder on Brightspace. Note – this homework has several OPTIONAL problems at the end. These are not required but can give you more practice problems if you’d like to do them 1. For each of the following indicate if they would contain genetic material that is 100% identical? Explain your answer. a. homologous chromosomes b. sister chromatids c. X and Y chromosomes 2. For the following events, specify whether they occur during mitosis, meiosis I, or meiosis II: a. Separation of conjoined chromatids within a pair of sister chromatids b. Pairing of homologous chromosomes c. Alignment of chromatids along the metaphase plate d. Attachment of sister chromatids to both poles 3.A eukaryotic cell is diploid, containing 10 chromosomes (five in each set). For mitosis and meiosis, how many daughter cells would be produced, and how many chromosomes would each one contain? 4. A cell has four pairs of chromosomes. Assuming that crossing over does not occur, what is the probability that a gamete will contain all of the paternal chromosomes? If n equals the number of chromosomes in a set, which of the following expressions can be used to calculate the probability that a gamete will receive all of the paternal chromosomes: (1/2)n, (1/2)n–1, or n1/2? . 5. With regard to the question above, how would the phenomenon of crossing over affect the results? In other words, would the probability of a gamete inheriting only paternal chromosomes be higher or lower? Explain your answer. 6. Describe the difference between genotype and phenotype. Give three examples. Is it possible for two individuals to have the same phenotype but different genotypes? 7. With regard to genotypes, what is a true-breeding organism? 8. Describe the significance of nonparentals with regard to the law of independent assortment. In other words, explain how the appearance of nonparentals refutes a linkage hypothesis. 9. A cross was made between a white male dog and two different black females. The first female gave birth to eight black pups, and the second female gave birth to four white and three black pups. What are the likely genotypes of the male parent and the two female parents? Explain whether you are uncertain about any of the genotypes. 10. Albinism, a condition characterized by a partial or total lack of skin pigment, is a recessive human trait. If a phenotypically unaffected couple produced an albino child, what is the probability that their next child will be albino? 11. For pea plants with the following genotypes, list the possible gametes that the plant can make: a.TT Yy Rrb.Tt YY rrc.Tt Yy Rrd.tt Yy rr
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