When A Child Is Born With Down Syndrome Where Did The Mutation Occur? Most cases of Down syndrome are not inherited. When the condition is caused by trisomy 21, the chromosomal abnormality occurs as a random event during the formation of reproductive cells in a parent. The abnormality usually occurs in egg cells, but it
When Is Germinal Period? The germinal period is the first 2 weeks of prenatal development after conception, which involves rapid cell division and the start of cell differentiation. First Stages of the Germinal Period. The original zygote as it divides into two cells, four cells and eight cells. What happens during the germinal period? The
Is A Connection Between The Pulmonary Trunk And The Aorta In The Fetus? During fetal development, the ductus arteriosus serves as a shunt between the pulmonary artery and the aorta. In the fetus, the blood is oxygenated in the placenta before being returned to the body. The lungs are filled with amniotic fluid and therefore
What Are The Steps Of Prenatal Development? There are three stages of prenatal development: germinal, embryonic, and fetal. What are the 3 major stages of prenatal development? This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is
What Are Some Factors That Can Affect Fetal Development? Genetic, nutritional, environmental, uteroplacental, and fetal factors have been suggested to influence fetal growth. Uteroplacental and umbilical blood flow and transplacental glucose and fetal insulin are major determinants of fetal growth. What factors can affect the development & health of a baby before birth? Prenatal risk
What Are The Most Important Themes Of Development During The Fetal Period? The embryonic period is the most critical period of development because of the formation of internal and external structures. What develops during fetal period? Stages of development: During the fetal stage, the brain develops and the body adds size and weight, until the
What Are The Stages Of Prenatal Development? There are three stages of prenatal development: germinal, embryonic, and fetal. What is the most important stage of prenatal development? The embryonic period is the most critical period of development because of the formation of internal and external structures. The critical periods of development for the organs are
What Are The Fetal Circulatory System Adaptations And How Do They Benefit The Fetus? Through the blood vessels in the umbilical cord, the fetus gets all needed nutrition and oxygen. The fetus gets life support from the mother through the placenta. Waste products and carbon dioxide from the fetus are sent back through the umbilical
What Best Describes The Symptoms Of Fetal Alcohol Syndrome? Distinctive facial features, including small eyes, an exceptionally thin upper lip, a short, upturned nose, and a smooth skin surface between the nose and upper lip. Deformities of joints, limbs and fingers. Slow physical growth before and after birth. Vision difficulties or hearing problems. What are
What Cushions The Growing Foetus And Protects It From Bumps And Jolts? The fetus is protected by the uterus and the amniotic fluid , a liquid contained in a bag called the amnion. How is the baby cushioned from bumps and jolts? It gets oxygen and nourishment from the mother’s blood via the placenta (pluh-SEN-tuh).