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Conception
This is the process of the sperm fertilizing the ovum. -
Chromosome
At the moment of conception, every human baby receives 46 chromosomes. Each chromosome has hundreds to thousands of genes. A gene is a unit that determines a human's inherited characteristis. -
Genome
Genome is the complete blueprint for the creation of a person. -
DNA
DNA are complex molecules that make up genes. A human's 46 chromosomes form the person;s unique DNA. NO two people, except twins can have the identical DNA. -
Prenatal Development
This is also the baby's development, often being divided into three stages called the germinal stage, embryonic stage, and fetal stage. -
Cell Division
The zygote starts to grow by cell division while still in the fallopian tubes. The single cell splits into two cells, then the two cells rapidly multiply to four, and then to eight, and so on. Within a few days, the zygote has grown into about 500 living cells. About four days of growth and slow movement, the zygote reaches the opening uterus. -
The Germinal Stage
This is the first stage in a baby's development. The germinal stage includes the formation of the zygote. The zygote is the fertilized egg. This is the key steps in establishing a pregnancy, and it only lasts about 2 weeks. -
Implantation
The lining of the uterus is now thick enough to provide a place for the zygote to attach itself and continue to grow. The zygote implants in the lining of the uterus and is covered by that lining. And even though the zygote is barely big enough to see with a microscope, it is ready to grow into a human being. -
The Embryonic Stage
This being the second stage of pregnancy, The growing baby is referred to as an embryo from the third week of pregnancy to the eighth week. During the first few eight weeks the baby's face, eyes, ears, limbs, and bones begin to form.