FAQ: What Begins As A Single-cell Structure That Is Created When A Sperm And Egg Merge At Conception?
- 1 What is created when a sperm and egg merge?
- 2 What develops in the embryonic stage?
- 3 What happens during the germinal stage of prenatal development?
- 4 What are the 3 main stages of prenatal development?
- 5 What are the 6 steps of fertilization?
- 6 Is the cell created when a sperm enters an egg?
- 7 What are the 5 stages of embryonic development?
- 8 What is the most critical stage of pregnancy?
- 9 What is the first organ to develop in the embryo?
- 10 What are 3 major developments in the germinal period?
- 11 What takes place during the germinal stage?
- 12 What is the germinal period of pregnancy?
- 13 What is the last thing to develop in a fetus?
- 14 How do teratogens cause birth defects?
- 15 What are the factors that affect prenatal development?
What is created when a sperm and egg merge?
Sexual reproduction starts with the combination of a sperm and an egg in a process called fertilization. Fertilization, pictured in Figure 1a is the process in which gametes (an egg and sperm) fuse to form a zygote.
What develops in the embryonic stage?
The embryonic stage plays an important role in the development of the brain. Approximately four weeks after conception, the neural tube forms. This tube will later develop into the central nervous system including the spinal cord and brain. The neural tube begins to form along with an area known as the neural plate.
What happens during the germinal stage of prenatal development?
During the germinal stage, the cells necessary for the placenta, umbilical cord, and amniotic fluid will differentiate to form the embryo. The mass of cells has yet to attach itself to the lining of the uterus; once this attachment occurs, the next stage begins.
What are the 3 main stages of prenatal development?
There are three stages of prenatal development: germinal, embryonic, and fetal.
What are the 6 steps of fertilization?
What are the 6 steps of fertilization?
- Sperm Capacitation.
- Sperm-Zona Pellucida Binding.
- The Acrosome Reaction.
- Penetration of the Zona Pellucida.
- Sperm-Oocyte Binding.
- Egg Activation and the Cortical Reaction.
- The Zona Reaction.
- Post-fertilization Events.
Is the cell created when a sperm enters an egg?
Humans. In human fertilization, a released ovum (a haploid secondary oocyte with replicate chromosome copies) and a haploid sperm cell (male gamete)—combine to form a single 2n diploid cell called the zygote.
What are the 5 stages of embryonic development?
The Stages of Embryo Development
- Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa).
- Blastocyst Development.
- Blastocyst Implantation.
- Embryo Development.
- Fetal Development.
What is the most critical stage of pregnancy?
The first trimester is the most crucial to your baby’s development. During this period, your baby’s body structure and organ systems develop. Most miscarriages and birth defects occur during this period.
What is the first organ to develop in the embryo?
The heart is the first organ to form during development of the body. When an embryo is made up of only a very few cells, each cell can get the nutrients it needs directly from its surroundings.
What are 3 major developments in the germinal period?
The germinal stage involves several different processes that change an egg and sperm first into a zygote, and then into an embryo. The processes include fertilization, cleavage, blastulation, and implantation.
What takes place during the germinal stage?
The germinal period (about 14 days in length) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus. During this time, the organism begins cell division and growth. After the fourth doubling, differentiation of the cells begins to occur as well.
What is the germinal period of pregnancy?
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 is the last thing to develop in a fetus?
By the end of the third month, the fetus is fully formed. All the organs and limbs (extremities) are present and will continue to develop in order to become functional.
How do teratogens cause birth defects?
As a baby grows in the womb, teratogens may affect parts of the baby’s body as they are forming. For example, the neural tube closes in the first 3 to 5 weeks of the pregnancy. During this time, teratogens can cause neural tube defects such as spina bifida.
What are the factors that affect prenatal development?
Prenatal risk factors include chronic maternal illness, certain maternal infections, toxin exposures and nutritional deficiencies. Risk factors in the perinatal period include pregnancy-related complications, prematurity and low birth weight, and infection exposure during pregnancy or at time of birth.