F09 Bio1010 Exam Microbiology

Meiosis i in the mothers egg production meiosis ii in

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Unformatted text preview: will prevent a normal allele of the gene from being expressed in heterozygous individuals. D. An affected individual must have two maternal copies (or two paternal copies) of the gene. 37. Lee’s mother has albinism, which is a recessive autosomal trait. Lee’s father has phenylketonuria (PKU), also recessive autosomal. Lee just got married and discovers that his new father ­in ­law has albinism and PKU. What is the probability that Lee’s first child will have BOTH albinism and PKU? A. B. C. D. E. 1/16 1/8 1/4 1/2 2/3 Lee must be carrier for BOTH PKU and albinism, as is his wife. Probability that child will have BOTH conditions: ¼ (PKU) * ¼ (albinism) = 1/16 11 38. Imagine that a cell acquired a genetic mutation so that the primase enzyme is unable to make RNA primers. Assuming that all of the other enzymes directly involved in DNA replication are still functional in these cells, how much of the process of DNA replication would you expect to see in these cells? A. B. C. D. The leading strand would be synthesized, but not the lagging strand. None of it at all; no part of the DNA replication process could occur. The DNA helix would be unwound by helicase, but no new strands would be produced. Both the leading and lagging strand would be synthesized, but Okazaki fragments would not be joined together. Figure 5. Pedigree. 39. Examine the pedigree in the figure above. Which of the following inheritance patterns is most likely responsible for the “affected” condition? A. B. C. D. autosomal dominant autosomal recessive X ­linked recessive X ­linked dominant Note unaffected parents having affected children of both sexes. 40. An XXY individual may have resulted from nondisjunction occurring in any of the following EXCEPT: A. B. C. D. meiosis I in the father’s sperm production. meiosis II in the father’s sperm production. meiosis I in the mother’s egg production. meiosis II in the mother’s egg production. 12 41. In Drosophila melanogaster (fruit flies), the allele for long wings is dominant over the allele for vestigial wings, and the allele for a brown body is dominant over the allele for a black body. A testcross was...
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