Knockout mice have been genetically altered to knock out specific genes. how are these mice most often used in research?
a. to examine defects in dna structure in those regions that have been altered
b. to determine the role of proteins coded for by those genes that are knocked out
c. to study dna replication in the defective genes (those that have been altered)
d. to study the effect of radiation on dna

Option C is the correct answer

C. to study DNA replication in the defective genes (those that have been altered)

Explanation:

They are used to study the roles of genes which have been altered but whose function is yet to be determined.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.