how many chromosomes will be there in the zygote?
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During sexual reproduction, fertilization of the ovum (n, 23 chromosomes) by the sperm (n, 23 chromosomes) restores the diploid number and creates a zygote (2n, 46) (awww..) that divides and grows by mitosis to form a multicellular human.
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With n = 23 in human cells, there are over 8 million possible combinations of paternal and maternal chromosomes. (CC BY 4.0 via OpenStax College). In humans, there are over 8 million configurations in which the chromosomes can line up during metaphase I of meiosis.
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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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Germ cells contain a complete set of 46 chromosomes (23 maternal chromosomes and 23 paternal chromosomes). By the end of meiosis, the resulting reproductive cells, or gametes, each have 23 genetically unique chromosomes. The overall process of meiosis produces four daughter cells from one single parent cell.
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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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It occurs twice for making chromosomal number constant in the next generation, ie., from diploid (2 N) to haploid (1N) in gametes, so that during fertilization, the two haploid gametes (23 + 23) unite to form diploid zygotic cell (2N) consisting 46 chromosomes.
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Normally, meiosis causes each parent to give 23 chromosomes to a pregnancy. When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn't happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy).
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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.
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During sexual reproduction, fertilization of the ovum (n, 23 chromosomes) by the sperm (n, 23 chromosomes) restores the diploid number and creates a zygote (2n, 46) that divides and grows by mitosis to form a multicellular human.
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The number of chromosomes is reduced from 46 (23 pairs) to 23 during the process of meiosis. 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.
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Because the number of chromosomes is halved during meiosis, gametes can fuse (i.e. fertilization) to form a diploid zygote that contains two copies of each chromosome, one from each parent. ... Meiosis produces haploid gametes (ova or sperm) that contain one set of 23 chromosomes.
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It is a two-step process that reduces the chromosome number by half—from 46 to 23—to form sperm and egg cells. When the sperm and egg cells unite at conception, each contributes 23 chromosomes so the resulting embryo will have the usual 46.
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The true statement is letter D. 1, 2 & 3. A zygote is the first cell of a new organism, a human zygote has 23 pairs of chromosomes 23 form the mother and 23 from the father and a zygote is produced through fertilization.
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Each cell in a normal human embryo has 23 pairs of homologous chromosomes, for a total of 46 chromosomes per cell.
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As the above image shows, there are 8 chromosomes present, but 16 chromatids. Similarly, in humans (2n=46), there are 46 chromosomes present during metaphase, but 92 chromatids.
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When a woman becomes pregnant, her egg joins with the father's sperm to make a new cell. This cell will grow and divide into a baby. This first cell has 46 chromosomes, 23 from the mother and 23 from the father.
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During fertilization, gametes from the sperm combine with gametes from the egg to form a zygote. The zygote contains two sets of 23 chromosomes, for the required 46. Most women are 46XX and most men are 46XY, according to the World Health Organization. There are some variations, though.