Chapter 5: Problem 25
DNA markers have greatly enhanced the mapping of genes in humans. What are DNA markers, and what advantage do they confer?
Chapter 5: Problem 25
DNA markers have greatly enhanced the mapping of genes in humans. What are DNA markers, and what advantage do they confer?
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Get started for freeWhy are double-crossover events expected less frequently than single-crossover events?
A female of genotype \\[ \frac{a}{+}+b^{c} \\] produces 100 meiotic tetrads. Of these, 68 show no crossover events. Of the remaining 32,20 show a crossover between \(a\) and \(b, 10\) show a crossover between \(b\) and \(c,\) and 2 show a double crossover between \(a\) and \(b\) and between \(b\) and \(c .\) Of the 400 gametes produced, how many of each of the 8 different genotypes will be produced? Assuming the order \(a-b-c\) and the allele arrangement previously shown, what is the map distance between these loci?
The genes dumpy\((d p),\) clot \((c l),\) and apterous \((a p)\) are linked on chromosome II of Drosophila. In a series of two-point mapping crosses, the following genetic distances were determined. What is the sequence of the three genes?
What two essential criteria must be met in order to execute a successful mapping cross?
Describe the cytological observation that suggests that crossing over occurs during the first meiotic prophase.
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