If two genes are on separate chromosomes, and one of the two is tightly linked to the centromere, what is the outcome of a single crossover between the centromere and the gene that is not tightly linked to the centromere? Non-parental ditype Tetratype Parental ditype
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Step 1: If two genes are on separate chromosomes, they will assort independently. Show more…
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In the diagram below, "+" indicates a healthy colony that grew on the given plate and "-" indicates that the cells did not grow on the given plate. b) For tetrads 5–10 (1.5 points each), indicate whether it is the parental ditype (PD), nonparental ditype (NPD), or tetratype (T). (Please note that tetrads 1–4 have been completed for your reference.) Tetrad 1: PD Tetrad 2: NPD Tetrad 3: T Tetrad 4: NPD Tetrad 5: _____ Tetrad 6: _____ Tetrad 7: _____ Tetrad 8: _____ Tetrad 9: _____ Tetrad 10: _____ c) Are these two genes (Lys2 and Leu2) linked or unlinked? Briefly explain your answer. (2 points)
Adi S.
Consider the Neurospora cross $+;+\times f ; p$ It is known that the $+/ f$ locus is very close to the centromere on chromosome $7-$ in fact, so close that there are never any second-division segregations. It is also known that the $+/ p$ locus is on chromosome 5 , at such a distance that there is usually an average of 12 percent seconddivision segregations. With this information, what will be the proportion of octads that are a. parental ditypes showing $\mathrm{M}_{\mathrm{I}}$ patterns for both loci? b. nonparental ditypes showing $\mathrm{M}_{\mathrm{I}}$ patterns for both loci? c. tetratypes showing an $\mathrm{M}_{\mathrm{I}}$ pattern for $+/ f$ and an $\mathrm{M}_{\mathrm{II}}$ pattern for $+/ p ?$ d. tetratypes showing an $\mathrm{M}_{\mathrm{II}}$ pattern for $+/ f$ and $\mathrm{an} \mathrm{M}_{\mathrm{I}}$ pattern for $+/ p ?$
Consider two genes, A and B, with alleles A, a and B, b respectively. These genes are incompletely linked on the same chromosome. Consider an individual heterozygous for both these genes such that the alleles "A" and "B" are on one homolog and the alleles "a" and "b" are on the other homolog. Draw three individual tetrads that would form during meiosis in such an individual. Assume crossing over in exactly one of the three tetrads involving one pair of non-sister chromatids between the two genes. The remaining two non-sister chromatids do not undergo crossing over. (Assume that the above individual is a human male, so every daughter cell at the end of meiosis forms a male gamete). What is the number of gametes of each type that would be produced following meiosis involving all these three tetrads? (AB= noncross over gamete, ab= noncrossover gamete, Ab= crossover gamete, aB= crossover gamete). 6 AB, 6 ab, 0 Ab, 0 aB 4 AB, 4 ab, 2 Ab, 2 aB 5 AB, 5 ab, 1 Ab, 1 aB 2 AB, 2 ab, 4 Ab, 4 aB 3 AB, 3 ab, 3 Ab, 3 aB
Katlin K.
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