Question

fraternal twins share __ of the same genes, while identical twins share __ of the same genes. 50% on average; 100% 25%; 75% 100%; 50% none; 50%

Explanation:

Fraternal twins develop from two separate eggs fertilized by two different sperm, so they share about 50% of their genes on average, similar to regular siblings. Identical twins develop from a single fertilized egg that splits, so they share 100% of their genes.

Answer:

A. 50% on average; 100%