Formation of a retinoblastoma eye tumor requires:
A. A germinal mutation in one Rb allele
B. A somatic mutation that turns on the Rb gene
C. A germinal mutation in one Rb allele, then a somatic mutation in the other allele
D. A germinal mutation in the dominant Rb allele
E. Activation of the X-linked oncogene Rb
Answer: C. A germinal mutation in one Rb allele, then a somatic mutation in the other allele
You might also like to view...
Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. What is/are the possible genotype(s) of person 4?
A) AA
B) Aa
C) Either AA or Aa
D) aa
E) Cannot be determined
A consequence of asexual reproduction in a plant is that __________.
A. gametes are produced in large numbers B. a partner is needed for reproduction C. pollen dispersal is critical to survival D. its entire genetic legacy can remain intact
In multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results
How does this disease manifest at the level of the action potential? I) Action potentials move in the opposite direction on the axon. II) Action potentials move more slowly along the axon. III) No action potentials are transmitted. A) only I B) only II C) only III D) only II and III
A scientist is studying endosymbiosis in cells. This means she is investigating
A. how mitochondria and chloroplasts evolved into eukaryotic cells. B. how mitochondria and chloroplasts evolved into prokaryotic cells. C. how mitochondria and chloroplasts were derived from eukaryotic cells. D. how mitochondria and chloroplasts were derived from prokaryotic cells.