Your friends Ben and Jane are contemplating having children and seek your genetic counsel. Ben and Jane are unrelated, but both have younger brothers with the same, extremely rare genetic trait. (In fact, Ben and Jane met at a support group meeting for children and families of children with this rare disorder.) Ben’s parents and Jane’s parents are all unaffected.        

 Assume that the trait is X-linked recessive with complete penetrance. What is the probability that Ben and Jane’s first child will be affected? What is the probability that the first child will be a carrier? 

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#Question id: 4068

#Unit 3. Fundamental Processes

The three eukaryotic RNA polymerases can be distinguished by

a. the types of genes they transcribe.

b. the number and types of large subunits.

c. their differential sensitivities to cycloheximide.

d. their differential sensitivities to α-amanitin.

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#Question id: 2022

#Unit 4. Cell Communication and Cell Signaling

Which one of the following is not true for class 1 MHC protein?

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#Question id: 4942

#Unit 11. Evolution and Behavior

Which of the following has not yet been synthesized in laboratory experiments studying the origin of life?

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#Question id: 19335

#Unit 12. Applied Biology

Which one of the following nanotubes cannot be easily twisted?

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#Question id: 27156

#Unit 7. System Physiology – Animal

These are the set of hormones that the hypothalamus produces