A Low Coefficient of Coincidence Indicates That

question 43

Multiple Choice

A low coefficient of coincidence indicates that:

• A) far fewer double-crossover recombinant progeny were recovered from a testcross than would be expected from the map distances of the genes involved.
• B) crossing over has been enhanced for genes that are located near the centromere of chromosomes because there is less interference of one crossover on the occurrence of a second crossover event.
• C) single-crossover recombinant classes in the progeny have been increased because the genes involved produce lethal phenotypes when in parental gene combinations.
• D) there is a large map distance between one of the outside genes in the heterozygous parent and the middle gene, while there is a short map distance between the middle gene and the other outside gene.
• E) the physical distance between two genes is very short compared with the genetic map distance between these two genes.

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Definitions:

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Countries characterized by low levels of income, industrialization, and modernization, and often marked by high rates of poverty and economic vulnerability.

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