Question

which is a purpose for which a pedigree chart might be prepared?
○ to determine the gender of a fetus
○ to determine if a fetus has the correct number of chromosomes
○ to identify chromosomal defects
○ to identify the pattern of inheritance of a particular trait

Explanation:

A pedigree chart is used to trace the inheritance of traits in families. Determining gender of a fetus (first option) is not a pedigree's purpose. Determining chromosome number (third option) is done via karyotyping, not pedigrees. Identifying chromosomal defects (second option) is also karyotyping - related. The fourth option, identifying inheritance pattern of a trait, matches pedigree use.

Answer:

to identify the pattern of inheritance of a particular trait