A son is born with Kleinfelter's syndrome and hemophilia. His father was normal and his mother was a carrier for the recessive X-linked blood clotting disorder. What occurred in meiosis to produce this genetic outcome?
A) nondisjunction in meiosis I of the mother
B) nondisjunction in meiosis I of the father
C) nondisjunction in meiosis II of the father
D) nondisjunction in either meiosis I or meiosis II of the mother
E) nondisjunction in meiosis II of the mother
Answer: E
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Which of the following statements is true regarding bacteria?
A. Like many eukaryotes, bacteria species can be described by the biological species concept. B. The majority of bacteria species have already been cultured. C. Bacteria can influence and alter the behavior of eukaryotes. D. Soil "genome surveys" cannot be used to identify new bacteria species. E. Many groups of bacteria include methanogenic organisms.
Which of the following statements about meristems is false?
A. Meristems contain a mixture of differentiated and undifferentiated cells. B. Meristems consist of cells that repeatedly undergo mitosis. C. Meristems are found at the tips of stems. D. Meristems are found at the tips of roots. E. Growth only occurs at meristems and not in other regions of the plant body.
The colinearity rule describes
A. the spatial arrangement of alpha helices in proteins encoded by homeotic genes. B. the parallel arrangement of homeotic genes between different chromosomes. C. the correlation between the spatial arrangement of homeotic genes along the chromosome with their expression. D. the long stretches of DNA between homeotic gene complexes. E. The correlation between the timing and location of expression of homeotic genes.
Two populations that inhabit the same area but remain genetically distinct can best be called
A. species. B. sympatric species. C. allopatric species. D. subspecies (races). E. polymorphic.