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Ch. 5 - Chromosome Mapping in Eukaryotes
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All textbooksKlug 12th EditionCh. 5 - Chromosome Mapping in EukaryotesProblem 22

Chapter 5, Problem 22

An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc What can you conclude from the actual data about the location of the three genes in relation to one another?

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Hello everyone and welcome to today's video. So the following are the result of the F two generation of a three point cross. So what is the recombination frequency of Law C. A. C. And here we have it in the table now. In case you forgot. I want you to. I want to help you recall from Previous videos. But this recombination frequency is going to be and it's basically going to be the number of recombinant divided by the total number of offsprings. Science. A 100. Here in the table, we already have laid out what the recombinant of this cross is going to be. And here we have them as an R. If we are all of these up, we're going to see a total number of recombinant is going to be 25. While the total number of offspring from adding all the rose is going to be 155. Now if we multiply this times 100% in order to get a percentage of recombination frequency, we're going to see that this percentage is going to be equal to 16% and that is going to be represented by answer choice. C. I really hope this video up to you and I hope to see you on the next one
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Textbook Question
What possible conclusions can be drawn from the observations that in male Drosophila, no crossing over occurs, and that during meiosis, synaptonemal complexes are not seen in males but are observed in females where crossing over occurs?
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Textbook Question
An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc If these three genes were all assorting independently, how many genotypic and phenotypic classes would result in the offspring, and in what proportion, assuming simple dominance and recessiveness in each gene pair?
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Textbook Question
An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc Answer part (a) again, assuming the three genes are so tightly linked on a single chromosome that no crossover gametes were recovered in the sample of offspring.

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Textbook Question
Based on our discussion of the potential inaccuracy of mapping (see Figure 5.12), would you revise your answer to Problem 22? If so, how?
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Textbook Question
How do we know that in humans the X chromosomes play no role in human sex determination, while the Y chromosome causes maleness and its absence causes femaleness? Why are many expected crossover phenotypes missing? Can any of these loci be mapped from the data given here? If so, determine map distances.
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Textbook Question
Traditional gene mapping has been applied successfully to a variety of organisms including yeast, fungi, maize, and Drosophila. However, human gene mapping has only recently shared a similar spotlight. What factors have delayed the application of traditional gene-mapping techniques in humans?
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