Question

francesca is studying behavior genetics with mice that have been bred to be genetically similar to each other. this type of research is called a ____ study.

twin

cross - sectional

genetic

strain

Explanation:

When studying behavior genetics with mice bred to be genetically similar, it's a strain study. Twin studies involve twins (not applicable here), cross - sectional studies look at different groups at one time, and the term 'genetic' is too general. Strain studies use genetically similar organisms like these mice.

Answer:

strain