If two loci are 10 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them?
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If two loci are 10 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them?
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- If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the F1 be expected to produce? Derive the expected F2 genotypic and phenotypicConsider Cyclic Crossover on two Parent chromosomes: Parent1 = A0846172593B and Parent2 = 394B5721608A . Assume that Parent2 is the default and that crossover will occur at the data value in the 1st position. What will the child chromosome be?If the likelihood of a single crossover in a particular chromosomalregion is 10%, what is the theoretical likelihood of a double or triplecrossover in that same region? How would positive interferenceaffect these theoretical values?
- In Figure 4-6, why does the diagram not show meiosesin which two crossovers occur between the same twochromatids (such as the two inner ones)?If these segregation patterns are equally likely, what is the probability that a gamete produced by the individual who carries the translocatedchromosome will result in a viable offspring with a normal phenotype?In a testcross for two genes, what types of gametes are produced with (a) complete linkage, (b) independent assortment, and (c) incomplete linkage?
- An initial crossover event will occur between A and B, as indicated in the corresponding image. After this initial event occurs, a second cross over event occurs (not illustrated) involving the products of the first crossover event. Given the chromosome organization below, which two chromatids of the bivalent were involved and between which genes did the second crossover event occur to produce the indicated chromosomes? a. A B c, A b c, a B C, and a b C b. A B C, A B C, a b c, and a b c (return to the original crossover depicted in the image, and then determine how the second crossover event produced this arrangementIn Figure 4-8, some meiotic products are labeledparental. Which parent is being referred to in thisterminology?For a certain chromosomal region, the mean number of crossovers at meiosis is calculated to be two per meiosis. In that region, what proportion of meioses are predicted to have (a) no crossovers? (b) one crossover? (c) two crossovers?
- In Drosophila, the genes A, B, and C are linked and in the order given. The distances are A-B = 5 m.u. and B-C = 15 m.u. The interval exhibits 20% interference. How many double crossovers would be observed in a three-point cross involving A, B, and C out of 500 progeny?What gametes, and in what frequencies, are produced by a female Drosophila of genotype A B / a b when the genes are present in the same chromosome and the frequency of recombination between the genes is 8 percent?If the original parental cell had 12 pairs of homologous chromosomes, how many chromosomes would be in each gamete at the end of telophase II?