Which Characteristic is Least Important for a Model Genetic Organism

Question

Which characteristic is least important for a model genetic organism?
A)produces many offspring
B)small size
C)diploid state
D)small genome
E)short generation time

Accepted Answer

A very useful model organism for studying genetics would have these characteristics: small size,short generation time,produces numerous progeny,matings can be controlled,compact genome with little junk DNA.