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In a decision tree, what does a leaf node represent? 

You’re building a binary classifier that checks photos of insect traps for whether a dangerous invasive species is present. If the model detects the species, the entomologist (insect scientist) on duty is notified. Early detection of this insect is critical to preventing an infestation. A false alarm (false positive) is easy to handle: the entomologist sees that the photo was misclassified and marks it as such. Assuming an acceptable accuracy level, which metric should this model be optimized for?

When implementing k-NN, what is the purpose of the parameter k?

This question is based on the graph and table above. Assume you run k-NN and use k = 3. Using the distances reported in the table above, identify the nearest neighbors and determine how the new observation X would be classified (red or green).

Trisomy 21 is the cause of 

A translocation is the movement 

A karyotype involves a photograph of the chromosomes of a cell in interphase.

You have a normal vision male who is having children with a female that is heterozygous for color-blindness. Which of the following statements is true?

For an X linked trait, a male offspring receives the X linked allele 

A Barr body is the term used for an inactivated X chromosome in a human female.