why euploidy rarely occur in animal?
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Euploidy in Animals As a general rule polyploids can be tolerated in plants, but are rarely found in animals. One reason is that the sex balance is important in animals and variation from the diploid number results in sterility.
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Fertilisation does not lead to the formation of clones. Hence there is no chance of variation. On the other hand fission is a process by which the parent cell divides into two.
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Mating a male donkey to a female horse produces mules. ... The mule has 63 chromosomes and is sterile because the chromosomes cannot pair properly at metaphase of meiosis I.
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Using molecular motors, eukaryotic cells can transport materials throughout their cytoplasm much faster than prokaryotic cells can, which have to rely on simple diffusion. ... * Only the eukaryotes that reproduce asexually will occur as diploid cells.
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During sexual reproduction, meiosis generates genetic variation in offspring because the process randomly shuffles genes across chromosomes and then randomly separates half of those chromosomes into each gamete. The two gametes then randomly fuse to form a new organism.
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Answer and Explanation: If a horse has 32 chromosomes in all of its body cells then the gametes will have 16 chromosomes in each cell. Meiosis is the process of forming...
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In particular, eukaryotic cells divide using the processes of mitosis and meiosis. Mitosis is common to all eukaryotes; during this process, a parent cell splits into two genetically identical daughter cells, each of which contains the same number of chromosomes as the parent cell.
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Why do prokaryotes and eukaryotes differ in their reliance on mutations for generating genetic variation? no Eukaryotes possess a nucleus, prokaryotes do not. Prokaryotes do not reproduce sexually as do eukaryotes and therefore do not have sexual reproduction to aid in generating genetic variation within a population.
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In plants and animals Meiosis occurs in all animals and plants. The end result, the production of gametes with half the number of chromosomes as the parent cell, is the same, but the detailed process is different. In animals, meiosis produces gametes directly.
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Such a division of labour need not necessarily occur in the form of soma and germ cells. Even simple, unicellular organisms need to perform physiological tasks that cannot be efficiently accomplished simultaneously by the same cell.
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A female horse and a male donkey have a mule. But hinnies and mules can't have babies of their own. They are sterile because they can't make sperm or eggs. They have trouble making sperm or eggs because their chromosomes don't match up well.
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Technically, most bacteria are 'haploid' because they have only one chromosome. An odd number of chromosomes make a cell haploid. Some bacterial species have more than one chromosome per cell. So it would depend a bit on species.
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It occurs as a random error during cell division early in fetal development. As a result, some of the body's cells have the usual one X chromosome and one Y chromosome (46,XY), and other cells have an extra copy of the X chromosome (47,XXY).
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['mutation.', 'random mating between organisms.', 'random fertilization.', 'crossing over (or recombination) between chromatids of homologous chromosomes during meiosis.']
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In eukaryotes For example, most eukaryotes are diploid, like humans who have 22 different types of autosomes, each present as two homologous pairs, and two sex chromosomes. This gives 46 chromosomes in total.
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We learned in earlier chapters that familiar eukaryotes such as plants, animals, and fungi carry in their cells either one chromosome set (haploid) or two sets (diploid). In these species, the haploid and diploid states are both cases of normal euploidy.
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Haploid cells contain one set of chromosomes. ... In animals, haploid cells containing a single copy of each homologous chromosome are found only within gametes. Gametes fuse with another haploid gamete to produce a diploid cell. The nuclear division that forms haploid cells, which is called meiosis, is related to mitosis.