Quanzhou hotel children's mother

In the genetic process of a pair of relative traits, offspring individuals have traits that parents do not have. New traits must be recessive and controlled by a pair of recessive genes. Parents' traits are dominant and their genetic composition is heterozygous. So both parents have double eyelids and gave birth to a child with a single eyelid. Therefore, the genetic composition of father and mother is 33, and the genetic map is as follows:

As can be seen from the gene map, the gene composition that controls the eyelid traits of mother and child is 33 and 33 respectively.

So choose: 3.