Answer
The indifferent period of development covers the first six weeks of an embryo's development.
In this period sex characteristics of the embryo arent expressed.
Work Step by Step
When a zygote is formed, it has 46 chromosomes and the 23rd row is XX or XY, but in the first six weeks, that is not expressed, so that period is named the indifferent period. There is no difference between XX or XY zygote.
