You were recently introduced to your roommate's sibling.To your surprise,even though the siblings are the same sex,they look nothing alike.Which of the following is the best explanation of this situation?
A) They must have different parents,as genetic inheritance ensures that they share a significant number of genes.
B) Although they started out very similar genetically,their genotypes have changed during development to make them look very different.
C) Given the number of different combinations of genes possible during reproduction,it may be that the two siblings don't really share many genes.
D) One has expressed only recessive genes,while the other has not.

Question

Quizplus · Accepted Answer

The statement acknowledges the fact that there are a vast number of different combinations of genes possible during reproduction. Therefore, it is possible that the two siblings don't share many genes even though they are siblings of the same sex. This option seems to be the most logical explanation. Option A is incorrect as it assumes that they must have different parents. Option B is incorrect as genotype or genetic makeup doesn't change during development. Option D is incorrect as it implies that one sibling has only inherited recessive genes, which is highly unlikely.

You Were Recently Introduced to Your Roommate's Sibling