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Questions and Answers
Which of the following is true about crossing over?
Which of the following is true about crossing over?
- It occurs between sister chromatids
- It results in recombination (correct)
- It only produces parental gametes
- It is not related to gene mapping
What does complete linkage between two genes mean?
What does complete linkage between two genes mean?
- The genes are located on different chromosomes
- The genes are located far apart on the same chromosome
- The genes are located close together on the same chromosome
- There is no crossing over between the genes (correct)
What does a chromosome map indicate?
What does a chromosome map indicate?
- The order of genes on a chromosome (correct)
- The type of genes on a chromosome
- The number of genes on a chromosome
- The location of genes on different chromosomes
What is a linkage group?
What is a linkage group?
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What is the relationship between the frequency of crossing over and the distance between genes on a chromosome?
What is the relationship between the frequency of crossing over and the distance between genes on a chromosome?
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Study Notes
Crossing Over and Linkage
- Crossing over is the exchange of genetic material between homologous chromosomes during meiosis, resulting in genetic recombination.
- Complete linkage between two genes means that they are always inherited together due to their close proximity on the same chromosome.
- A chromosome map indicates the relative positions of genes along a chromosome, showing the distance between genes in terms of the frequency of crossing over.
- A linkage group is a set of genes that tend to be inherited together because they are located close to each other on the same chromosome.
- The frequency of crossing over is directly related to the distance between genes on a chromosome: the closer the genes are, the lower the frequency of crossing over, and vice versa.
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