Which of the following does not describe the pedigree analysis of an autosomal dominant disorder?
a. heterozygotes are affected
b. two affected parents will always have affected children
c. affected children usually have an affected parent
d. two unaffected parents will not have affected children
b. two affected parents will always have affected children
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If a human female has 2 Barr bodies per cell, it is almost certain that
A. her father had 1 Barr body per cell. B. her mother also had 2 Barr bodies per cell. C. she developed from a fertilized egg with 3 X chromosomes. D. she is genetically a male with female characteristics. E. she is genetically a normal fertile female.
The greatest population growth rate occurs in the
A. exponential growth phase. B. lag phase. C. stable equilibrium phase. D. growth curve.
Which of the following is a valid scientific concern about the environment and transgenic crops?
A) The toxic products of the modified genes would be released to the environment when the plants die, resulting in drastic die-offs of local wildlife. B) Pollen from transgenic crops could carry the recombinant genes to wild relatives, with unpredictable consequences. C) Wild animals might eat the transgenic crops and become genetically mutated. D) Eating transgenic foods will permanently change human DNA.
An organic molecule always contains one or more atoms of _____.
A) sulfur B) carbon C) oxygen D) nitrogen