Final answer:
A heritability coefficient of 0 for number of arms indicates that genetic factors do not contribute significantly to the variation in the number of arms among individuals.
Step-by-step explanation:
The heritability coefficient for number of arms being about 0 means that the variation in the number of arms is not influenced by genetic factors. A heritability coefficient of 0 for number of arms indicates that genetic factors do not contribute significantly to the variation in the number of arms among individuals.
In other words, genetic differences do not significantly contribute to the differences in the number of arms among individuals. Instead, other factors such as environmental or developmental influences are likely to be responsible for the variation in the number of arms.