An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.
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First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
A zygote forms when a sperm penetrates the outer surface of an egg. This happens in the fallopian tube. While the zygote stage is very brief, lasting only the early days of conception, it is important. The single-celled zygote contains all of the genetic information required to form a fetus.
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After four divisions, the conceptus consists of 16 blastomeres, and it is known as the morula. Through the processes of compaction, cell division, and blastulation, the conceptus takes the form of the blastocyst by the fifth day of development, just as it approaches the site of implantation.
The amount and distribution of yolk determines where cleavage can occur and the relative size of the blastomeres. When one pole of the egg is relatively yolk-free, the cellular divisions occur there at a faster rate than at the opposite pole.
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In humans, the zygote is the first cell stage of pregnancy. It is located first in the fallopian tube and moves towards the uterus. As the zygote travels, it divides to give rise to cells that will also undergo mitosis. Soon, the zygote will transition into an embryo that will be implanted in the uterus.
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Several factors for causes of embryo splitting were suggested, including maternal age, prolonged embryo culture, ovarian stimulation, and zona pellucida (ZP) manipulation [6].
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The fertilization brings together 23 chromosomes from the male and 23 chromosomes from the female, resulting in the formation of a fertilized egg cell with 46 chromosomes. The fertilized cell is a zygote. The zygote undergoes mitosis to form two identical cells that remain attached.
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Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells.
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Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
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Usually the cell will divide after mitosis in a process called cytokinesis in which the cytoplasm is divided and two daughter cells are formed.
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Centrioles are paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope. Centrioles play a role in organizing microtubules that serve as the cell’s skeletal system. They help determine the locations of the nucleus and other organelles within the cell.
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When pollen grains reach the stigma of a flower’s female structures, a pollen grain containing two sperm makes its way into the ovary. One sperm fertilizes one egg, which becomes a diploid zygote. The other sperm fuses with polar nuclei to form endosperm that will nourish the zygote as it matures into a seed.
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After the process of fertilisation, the zygote travels down in the oviduct and divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is called embryo.
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It takes about five to six days for a zygote to transform into a blastocyst (a microscopic ball of cells) and then into an embryo. Within hours after sperm meets egg, the zygote divides and then continues to divide (and divide). Within days, it’s turned into a blastocyst that’s around one-fifth the size of a period.
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The zygote grows by mitosis to form an embryo.
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For the first 12 hours after conception, the fertilized egg remains a single cell. After 30 hours or so, it divides from one cell into two. Some 15 hours later, the two cells divide to become four. And at the end of 3 days, the fertilized egg cell has become a berry-like structure made up of 16 cells.
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Hence 7 mitotic divisions cell needed for a single cell to make 128 cells. Was this answer helpful?
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Two divisions, meiosis I and meiosis II, are required to produce gametes (Figure 3). Meiosis I is a unique cell division that occurs only in germ cells; meiosis II is similar to a mitotic division.
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After fertilization, the zygote undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form.
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Answer. The first cleavage division of zygote occur when it is TRAVELING down the fallopian tube and just before it is to be transplanted in the uterus .
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The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. During cleavage, the zygote divides but maintains its size in the process. This zygotic division produces blastomeres which later make up the hollow sphere known as the blastula.
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During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining ” a process called implantation.
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Gametes are haploid. Male gamete is called sperm and female gamete is called egg. E.g. Human sperm cell and egg cell contain 23 chromosomes each. After fertilisation, zygote formed will contain 46 chromosomes.