how many unique gametes could be produced by an individual with the genotype aabb?
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There are four possible combinations of gametes for the AaBb parent. Half of the gametes get a dominant A and a dominant B allele; the other half of the gametes get a recessive a and a recessive b allele. Both parents produce 25% each of AB, Ab, aB, and ab.
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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.
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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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How many possible combinations can arise? The fusion of two gametes (each with over 8 million possible chromosome combinations from independent assortment) produces a zygote with over 64 trillion diploid combinations (this is without considering crossing over!)
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An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.
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In humans, over 8 million (223) chromosome combinations exist in the production of gametes in both the male and female. A sperm cell, with over 8 million chromosome combinations, fertilizes an egg cell, which also has over 8 million chromosome combinations.
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How many types of zygotic combinations are possible between a cross Aa BB Cc Dd x AA bb Cc DD? The number of possible gamates = 2n, where n is number of heterozygous pairs of genes. When 8 combinations are crossed with 2 combination, the number of zygotic combinations = 8 x 2 = 16.
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A human gamete has one sex chromosome. Human gametes, or sex cells, are haploid cells that contain 23 chromosomes total: 22 autosomes and exactly one...
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Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.
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If you know the haploid number for an organism, you can calculate the number of possible combinations in the gametes. The possible combinations are equal to 2n, where n is the haploid number. For the organism in Figure 9-18, n = 2, so the number of chromosome combinations is 22, or 4.
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It allows for the transmission of virtually limitless combinations of genes from parent to offspring. The resulting gametes have 23 new chromosomes, one member of each of the 23 pairs, representing unique combinations of the original maternal and paternal copies.
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Consider the possible combinations when that sperm cell is united with an egg cell that is also 1 of 8,000,000 combinations. The resulting diploid zygote is one of over 64,000,000,000,000 possible combinations of the genes of the two parents.
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The genetic basis of Down syndrome There are 23 pairs of chromosomes, for a total of 46. Half the chromosomes come from the egg (the mother) and half come from the sperm (the father). This XY chromosome pair includes the X chromosome from the egg and the Y chromosome from the sperm.
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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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['Crossing over (in prophase I)', 'Random assortment of chromosomes (in metaphase I)', 'Random fusion of gametes from different parents.']
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There are 8,324,608 possible combinations of 23 chromosome pairs. As a result, two gametes virtually never have exactly the same combination of chromosomes. Each chromosome contains dozens to thousands of different genes.
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Traits controlled by a single gene with more than two alleles are called multiple allele traits. An example is ABO blood type. There are three common alleles for this trait, which can be represented by the letters A, B, and O. As shown in Table below, there are six possible ABO genotypes but only four phenotypes.