Amanda's abnormal number of sex chromosomes resulted from ____________.
Nondisjunction in meiosis
9. The mitotic cell cycle results in the production of ______.
Two identical daugher cells with full complements of DNA
10. Crossing over during prophase I results in ______.
chromosomes of a homologous pair breaks and exchange genes. /Rearrangement of genetic material
18. Which of the following is the best description of the events of anaphase I?
Homologous chromosomes randomly separate and migrate to opposite poles.
This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ______.
All of the offspring would have widows peak.
23. According to Mendel's principle of segregation, ______.
A sperm/egg cell only carriers one allele for each inherited characteristic... P146
25. What if children with this disease always have attached earlobes, a recessive trait and a trait that is independently inherited. If both parents are heterozygous for attached earlobes, what is the probability that the second child will have the disease?
27. Marfan syndrome is the result of inheriting a single allele. Individuals with Marfan syndrome are tall and long-limbed, and have both cardiovascular and eye defects. The inheritance of Marfan syndrome is an example of ______.
29. An individual with the blood group genotype LMLN has the phenotype MN. What is the relationship between the LM and LN alleles?
32. Hypophosphatemia (vitamin D-resistant rickets) is inherited as an X-linked dominant. What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?
All offspring exhibit hypophosphatmia.
33. To determine the phenotype of an individual who expresses a dominant trait, you would cross that individual with an individual who ______.
Is homozygous recessive for the trait.
34. Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
37. Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
40. How can bacteriophage DNA be spread from cell to cell without causing cell death?
41. Once viruses are detected, the number of viruses increases rapidly. This is because ______.
the viruses lyse the hosts to release mature viruses all at once
48. The correct sequence of events occurring during transcription is ______.
initiation, elongation, termination
51. After replication, ______. (what is the composition of the new strands?)
one stand is old and one is new
52. HIV (human immunodeficiency virus) must use its own ______ to reproduce. (its unique enzyme is called what?)
54. The modern phrasing of Beadle and Tatum's hypothesis about relationships between genes and their products is "one gene-one ______."
63. What would you assume if you found RNA transcripts of lactose-utilizing genes within E. coli?
The presence of lactose
64. Developmental similarities among very different animals can be attributed to ______.
65. Cutting DNA with a particular restriction enzyme produces ______ that can be separated by gel electrophoresis.
67. An advantage of using reverse transcriptaanse to prepare a gene for cloning is that ______.
the resulting DNA strand does not code for a protein
68. The process of making multiple copies of a gene by inserting it into a host genome and culturing the host is called ______.
69. The following figure provides you with an overview of recombinant technology. The end result is a transgenic bacterium with a human gene that codes for marketable quantities of a human gene product. However, molecular biologists frequently have problems with the product. One problem might be ______.
production of a human protein that is unable to function properly
70. A DNA fragment with a sticky end that reads -ATTCG will bind with another DNA fragment with a sticky end that reads ______.
TAAGC- G - C A - T
73. The following figure shows that gel electrophoresis can be used to separate repetitive DNA sequences. Gel electrophoresis separates DNA fragments because ______.
DNA fragments have a negative charge and move to the positive pole
75. DNA fragments that have matching sticky ends are joined by bonds formed by the action of ______. (name the enzyme)
83. If one strand of a DNA double helix has the sequence GTCCAT, what is the sequence of the other strand?
CAGGTA G - C A - T