Final answer:
The coefficient of relatedness between full siblings, like a brother and sister, is 0.5, which represents the average proportion of shared genes between them. The correct option for the coefficient of relatedness is A) 0.5.
Step-by-step explanation:
The coefficient of relatedness between full siblings, such as a brother and sister, is 0.5.
This value represents the proportion of genes shared by full siblings, inherited from their common parents. Since full siblings receive half of their genetic material from each parent, they on average share half of their genes, hence the coefficient of relatedness is 0.5. When considering the options provided:
A) 0.5, B) 0.25, C) 0.125, D) 0, the correct option is A) 0.5, which should be mentioned as the correct option in the final answer.