Twins fertilization one egg two sperm

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Fungi[ edit ] In fungi, the sexual fusion of haploid cells is called karyogamy. The result of karyogamy is the formation of a diploid cell called zygote or zygospore. This cell may then enter meiosis or mitosis depending on the life cycle of the species. Plants[ edit ] In plants, the zygote may be polyploid if fertilization occurs between meiotically unreduced gametes. In land plants , the zygote is formed within a chamber called the archegonium. In seedless plants, the archegonium is usually flask-shaped, with a long hollow neck through which the sperm cell enters.
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Polyspermy

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Twins - identical and fraternal - Better Health Channel

Glossary How does multiple pregnancy occur? A pregnancy with more than one fetus is called multiple pregnancy. If more than one egg is released during the menstrual cycle and each is fertilized by a sperm, more than one embryo may implant and grow in your uterus. This type of pregnancy results in fraternal twins or more.
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What happens if two sperm fertilize one egg but it doesn't split into multiple babies?

Complications during pregnancy[ edit ] Main article: Vanishing twin Researchers suspect that as many as 1 in 8 pregnancies start out as multiples, but only a single fetus is brought to full term, because the other fetus has died very early in the pregnancy and has not been detected or recorded. There are several reasons for the "vanishing" fetus, including it being embodied or absorbed by the other fetus, placenta or the mother. This is known as vanishing twin syndrome.
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Its macula densa cells produce aldosterone. ACE inhibitors reduce blood pressure by causing less aldosterone and antidiuretic hormone to be released, resulting in more water output and a lowering of the blood volume, which lowers the blood pressure. The macula densa cells monitor the NaCl content of the filtrate entering the distal convoluted tubule. The parietal layer of the glomerular capsule is simple squamous epithelium. Osmosis Which of the following is not true regarding tubular reabsorption?
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