Which of these sibling pairs will share the greatest number of genes?
A)two brothers who were born of the same two parents 18 months apart
B)a brother and sister who are fraternal twins
C)two brothers who develop from the same fertilized egg
D)two sisters who are fraternal twins

Question

Quizplus · Accepted Answer

Two brothers who develop from the same fertilized egg (identical twins) share 100% of their genes, while two brothers born of the same parents (full siblings) share 50% of their genes. Fraternal twins, both same-sex or opposite-sex, are no more genetically similar than regular siblings. Therefore, the sibling pair that shares the greatest number of genes is two brothers who develop from the same fertilized egg.

Which of These Sibling Pairs Will Share the Greatest Number