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A molar pregnancy, also known as a hydatidiform mole, is an abnormal form of pregnancy in which a non-viable fertilized egg implants in the uterus. It falls under the category of gestational trophoblastic diseases. [1] During a molar pregnancy, the uterus contains a growing mass characterized by swollen chorionic villi, resembling clusters of ...
Triploid syndrome, also called triploidy, is a chromosomal disorder in which a fetus has three copies of every chromosome instead of the normal two. If this occurs in only some cells, it is called mosaic triploidy and is less severe. Most embryos with triploidy miscarry early in development.
In diandry, a partial hydatidiform mole develops. [66] These parent-of-origin effects reflect the effects of genomic imprinting. [citation needed] Complete tetraploidy is more rarely diagnosed than triploidy, but is observed in 1–2% of early miscarriages.
"Moles dig characteristic volcano-shaped hills in the lawn," says Smith. "The tunnels are dug at a rate of 18 feet per hour and can add 150 feet of new tunnels in the lawn each day."
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Here, first a fertilised egg implants into the uterus, but some cells around the fetus (the chorionic villi) do not develop properly. The pregnancy is not viable, and the normal pregnancy process turns into a benign tumour. There are two subtypes of hydatidiform mole: complete hydatidiform mole, and partial hydatidiform mole. [citation needed]
Molar pregnancies come in two types, complete moles and partial moles. Complete moles occur when two sperm fertilize an empty egg, and a partial mole occurs when two sperm fertilize a normal egg. In a complete mole there is no fetus. In a partial mole there is a fetus, but it has an abnormal number of chromosomes and is incompatible with life.