Question

A couple want to have two children who are genetically identical. Short of having identical twins engineered, which of the following statements best describes the number of offspring they should have to allow this?

Answer 1

Since the options are not given, I am giving a general answer.

The couple should have at least 2²³ children, which would make it around a billion. After having a billion children, it is most probable that the couple might have identical twins.

This is because identical twins are genetic clones resulting from the early splitting of an embryo, but they can be quite different in personality, body mass, and even gender. So, upon crossing over a billion times, the genetic traits get crossed over a billion times with the chromosomes from the same couple. Since there are 23 chromosomes and it involves 2 people, having 2²³ children can help the couple have identical twins naturally without any engineering.