how many chromosomes would be in the nucleus of the unfertilized egg?
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4 Drosophila unfertilized egg cell will have 4 chromosomes as egg cell is haploid and haploid number of chromosomes in drosophila is 4. Human egg cells will have 23 chromosomes, as the haploid number of chromosomes in humans is 23. Ans. 3 Meiosis is important because it produces gametes, female or male germ cells.
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All normal diploid individuals have some small fraction of cells that display polyploidy. Human diploid cells have 46 chromosomes (the somatic number, 2n) and human haploid gametes (egg and sperm) have 23 chromosomes (n).
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But sometimes an error occurs when the 46 chromosomes are being divided in half. An egg or sperm cell may keep both copies of chromosome number 21, instead of just 1 copy. If this egg or sperm is fertilized, then the baby will have 3 copies of chromosome number 21. This is called trisomy 21.
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In humans, special cells called germ cells undergo meiosis and ultimately give rise to sperm or eggs. Germ cells contain a complete set of 46 chromosomes (23 maternal chromosomes and 23 paternal chromosomes).
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Spermatids have half this number, for a total of 23 chromosomes. Each chromosome is composed of only a single chromatid following division, for a total of 23 chromatids. When the zygote is formed during the fusion of the sperm and egg cells, the final cell is diploid, containing 46 chromosomes (23 from each gamete).
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Each normal embryo contains 46 chromosomes, 23 of which are contributed by the sperm and 23 by the egg.
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In a human egg or sperm, there are 23 chromosomes, one of which is an X or Y.
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The egg and sperm cells are an exception--they have only 23 chromosomes each. ... Sperm and eggs end up with the DNA they get through a process called meiosis. When cells normally make new copies of themselves, each of the new cells ends up with 46 chromosomes (at least for humans).
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The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.
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Because they have only half the total chromosomes in a somatic cell, they are termed haploid (n). In a human egg or sperm, there are 23 chromosomes, one of which is an X or Y. A human egg is haploid (has 23 chromosomes) and a sperm is haploid (has 23 chromosomes).
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*except sperm cells and egg cells in the ovaries which are "haploid" and have 23 chromosomes (with the 23rd being an X in the eggs, and either an X or a Y in the sperm), and not 46 "diploid" like other cells.
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Short answer: A normal human gamete holds 23 chromosomes.
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Well, when an egg and a sperm come together, which is a process called fertilization, they contribute 23 chromosomes each.
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All the cells of the human body except the gamete cells (sperm and egg) contain 46 (23 pairs) of chromosomes. The nerve cell of human beings are somatic cells and hence contain 46 chromosomes.
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The basis of sexual reproduction is that a fertilized egg gets half its chromosomes from each parent—sperm and eggs each contributing one partner in each pair of chromosomes. We humans have 23 pairs of 46 chromosomes: so our sperm or eggs have 23 chromosomes each.
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Humans have 23 pairs of chromosomes. That means that one person could produce 223 different gametes. In addition, when you calculate the possible combinations that emerge from the pairing of an egg and a sperm, the result is (223)2 possible combinations.
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Humans have 46 chromosomes, That number of chromosomes will be found a, in cells in anaphase. - : b. in egg and sperm cells. in somatic cells.