Chapter
1. 4.4 Mapping a Three-Point Cross: A Solved Problem
Animated Art
4.4 Mapping a Three-Point Cross: A Solved Problem
1.1
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Question 1 of 8
Questions
Question
1.1
1. In a three-point cross, one parent is homozygous recessive for all three genes. Why is this important?
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Question
1.2
When the progeny of a three-point cross are first observed, the ____________ classes are the most abundant while the ____________ classes are the least abundant.
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Question
1.3
The order of the progeny phenotypes listed for the three-point cross ____________ the order of genes on the chromosome.
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Question
1.4
Reciprocal genotypes are observed in nearly equal numbers because:
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Question
1.5
If the parent has the following combinations of alleles—a+ b+ c and a b c+—which recombinants would be added together when determining the RF between genes b and c?
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Question
1.6
If the parent has the following combinations of alleles—a+ b+ c and a b c+—which recombinants would be added together when determining the RF between genes a and c?
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Question
1.7
The RF between genes a and b is 22%, the RF between genes a and c is 10%, while the RF between genes b and c is 13%. Which gene is in the middle?
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Question
1.8
For the RF calculated in the previous problem, 1468 progeny were scored and 12 were double crossovers. What is the interference value?