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

Question

Quizplus · Accepted Answer

Two brothers who developed from the same fertilized egg (also known as identical twins) share 100% of their genes, whereas siblings who are fraternal twins (such as option B) or born 18 months apart from the same two parents (option A) share about 50% of their genes. Fraternal twin sisters (option D) would also share 50% of their genes.

Which of These Sibling Pairs Will Share the Greatest Number