Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 12.4, Problem 2R
Summary Introduction
To review:
The recombination frequency between two genes depends on the physical distance between them, with the help of a diagram of a chromosome.
Introduction:
The progeny, which resemble the parent, is known as parental type, and those, in which a crossing over and exchange of genetic material takes place are known as recombinant progeny. Recombination frequency is obtained by dividing the number of recombinant progeny by the total number of progeny.
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Life: The Science of Biology
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- CONNECT Two loci exhibit 5% recombination between them. How many map units apart are they?arrow_forwardVariations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.arrow_forwardDiagram and describe how mispairing and crossing over between two different splitgenes could result in the production of genes with different combinations of exons.arrow_forward
- What structures are found in a chromosome? Group of answer choices Two structures for the mitotic spindle to bind, and two complex repetitive structures that are maintained by telomerase One structure for the mitotic spindle to bind, and two complex repetitive structures that are maintained by telomerase One structure for the mitotic spindle to bind, and one complex repetitive structure that is maintained by telomerase Two structures for the mitotic spindle to bind, and one complex repetitive structure that is maintained by telomerase.arrow_forwardHere is a strawberry karyotype - ignore the different colours. How many chromosomes are shown in the figure? What is the ploidy of this type of strawberry? How many alleles could an individual strawberry have at each locus? Finally during the G2 stage of cell division, how many double helixes would be in this picture if you drew them over the chromosomes? Many domesticated plants are polyploid - give one possible reason why this might be the case, with a focus on using genetic principles to reason it out (i.e., you don't have to be right per se, you have to build an argument based on what you've already learned).arrow_forwardConstruct a map of the chromosome from the following recombination frequencies between individual pairs of genes: c – f 8%, v – f 12%, s – v 16%, v – c 4%, s – f 6%arrow_forward
- In an electrophoretic gel across which is applied a powerful electrical alternating pulsed field, the DNA of the haploid fungus Neurospora crassa (n = 7) moves slowly but eventually forms seven bands, which represent DNA fractions that are of different sizes and hence have moved at different speeds. These bands are presumed to be the seven chromosomes. How would you show which band corresponds to which chromosome?arrow_forwardSketch and label the main parts of a duplicated chromosomearrow_forwardDescribe the technique of chromosome walking, and explain why it is used.arrow_forward
- List 8 different processes that affect the structure of the chromosomes. Explain how each process happensarrow_forwardDescribe why Sthenelais limicola an ideal organism for the demonstration of crossing over between chromosomes.arrow_forwardA diploid plant cell contains 2 billion base pairs of DNA. a. How many nucleosomes are present in the cell? b. Give the number of molecules of each type of histone protein associated with the genomic DNA.arrow_forward
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