Trisomy 18 is one of the most common trisomies observed in human populations. You prepare DNA samples from two unrelated infants, both with trisomy 18, and from their parents. You then type the infants and their parents for four SSRs distributed along chromosome 18:

 

                                              

In which parent did nondisjunction occur in Family 2?

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#Question id: 15387

#Unit 8. Inheritance Biology

How might the results of Bernard Davis's U tube experiment have been different if each strain were only mutant for a single gene?

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#Question id: 11273

#Unit 10. Ecological Principles

Use the following diagram of a hypothetical food web to answer the question. The arrows represent the transfer of energy between the various trophic levels. Which letter represents an organism that could only be a primary consumer and secondary carnivores respectively?

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#Question id: 1836

#Unit 4. Cell Communication and Cell Signaling

What is the feature that best uniquely describes NK cell activity against a virus-infected cell?

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#Question id: 15334

#Unit 4. Cell Communication and Cell Signaling

In which type of BCR (surface protein) present on to the B-cell, which are responsible for the conversion of membrane bound into secreted form of antibody. If it is not present then this conversion isn’t possible;

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#Question id: 31150

#Unit 2. Cellular Organization

The most common CFTR mutation is a deletion of a phenylalanine at position 508 in the protein sequence. This mutation prevents: