What is the low end of the normal range of a human gestation, when dating a pregnancy from the last menstrual period (LMP)?

The average length of human gestation is 280 days, or 40 weeks.

Explanation:

It is found that few women know the exact day they ovulated or conceived, an ultrasound performed in the first trimester of pregnancy has proven to be the most accurate way to date a pregnancy. ... If the ultrasound date is within seven days after your LMP date, so it will keep your LMP date.

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;