how many chromosomes can gamete possess result nondisjunction?
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In humans, gametes have 23 chromosomes. Sometimes either homologous chromosomes or sister chromatids fail to separate properly during meiosis. This is called nondisjunction, and it produces gametes with an abnormal number of chromosomes.
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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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In human reproduction, each cell contains 46 chromosomes in 23 pairs. Meiosis in the parents' gonads produces gametes that each contain only 23 chromosomes that are genetic recombinants of the DNA sequences contained in the parental chromosomes.
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In a diploid cell with four chromosomes (two homologous pairs), there are two equally possible ways for the chromosomes inherited from the two parents to be arranged during metaphase I. This variation in the orientation of chromosomes leads to gametes with four equally possible combinations of chromosomes.
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"Gametes" are specifically sex cells that have 23 chromosomes. "Diploid" refers to any cell that has all 46 chromosomes. "Zygote" is the result of two gamete (haploid) cells fusing, and becoming a diploid cell.
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Trisomy 21 (47,XY,+21) is caused by a meiotic nondisjunction event. A typical gamete (either egg or sperm) has one copy of each chromosome (23 total). When it is combined with a gamete from the other parent during conception, the child has 46 chromosomes.
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Haploid describes a cell that contains a single set of chromosomes. 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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For a human, n = 23, so there are 223, or about 8 million, possible chromosome combinations! The number of different chromosome combinations in gametes is one factor that contributes to genetic variation. A second factor is crossing over—the exchange of genetic material between homologous chromosomes.
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Maternal and paternal chromosomes are randomly distributed on either side of the metaphase plate. So for each pair there's a 50/50 chance as to which side the homologs will go on (8.17). We have 23 pairs each with 50/50 probabilities. That works out to 223 possible combinations of gametes from one human individual.
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A sperm cell contains 23 chromosomes with two possibilities for each chromosome. The possible number of sperm cells based on different chromosome combinations is (2)23 = 8,388,608.
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Nondisjunction during mitosis can result in cancer. Nondisjunction during meiosis results in one daughter cell having both of a pair of parental chromosomes with the other having none. It causes a mutation in the number of chromosomes, either extra chromosomes or missing chromosomes.
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Answer and Explanation: Sperm cells have 23 chromosomes.
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There are two possibilities for orientation at the metaphase plate; the possible number of alignments therefore equals 2n, where n is the number of chromosomes per set. Humans have 23 chromosome pairs, which results in over eight million (223) possible genetically-distinct gametes.
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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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"Haploid" refers to any cell that has 23 chromosomes (half of the total 46). "Gametes" are specifically sex cells that have 23 chromosomes. "Diploid" refers to any cell that has all 46 chromosomes. "Zygote" is the result of two gamete (haploid) cells fusing, and becoming a diploid cell.
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As gametes are formed, the 46 chromosomes from each parent cell (23 pairs of chromosomes) are divided through meiosis so that each gamete is haploid, having only 23 unpaired chromosomes.
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Your body is the result of the fusion of two gametes. One from each parent. Each of those gametes had 23 chromosomes, so that after the union of those gametes, when you were just a single cell, you had 46 chromosomes. Or, 23 pairs of chromosomes.