Nucleotides and the double helix. DNA, or deoxyribonucleic acid, is the heritable material found in all cells. DNA provides the instructions to build, maintain, and regulate cells and organisms and is passed on when cells divide and when organisms reproduce.
Calculating Conception. Gestational age, or the age of the baby, is calculated from the first day of the motherâs last menstrual period.Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is. Use our Pregnancy Calculator to calculate these dates for you.he baby can be measured as early as 5 or 6 weeks after the motherâs last menstrual period. Measuring the baby using ultrasound is most accurate in early pregnancy. It becomes less accurate later in pregnancy. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy.
Likely date of conception: End of your first trimester (12 weeks): End of your second trimester (27 weeks): Your baby is due on (40 weeks): Number of weeks you have been pregnant for: Calculate how many weeks you will be pregnant on a given date.Number of weeks you will be pregnant for: Calculate the date you will be pregnant for (input x) number of weeks.he formula to estimate the due date of a baby is calculated by adding 266 days to ovulation (Ovulation Calculator), or 280 days to the first day of your last menstrual cycle. Human female pregnancy lasts 40 weeks on average.