- 1(current)
Q. No.When the two genes in a dihybrid cross are situated on the same chromosome:
| 1. | The proportion of parental gene combinations was much higher than the non-parental type. |
| 2. | The proportion of parental gene combinations was much lesser than the non-parental type. |
| 3. | The proportion of parental gene combinations was equal to the non-parental type. |
| 4. | Only recombinants are formed. |
Subtopic: Recombination & Gene Mapping |
85%
Level 1: 80%+
Hints
Morgan coined the term ______ to describe this physical association of genes on a chromosome and the term _________ to describe the generation of non-parental gene combinations.
| 1. | Recombination; Linkage | 2. | Linkage, Mutation |
| 3. | Transposition, Mutation | 4. | Linkage, Recombination |
Subtopic: Understanding Linkage | Recombination & Gene Mapping |
86%
Level 1: 80%+
Hints
Genes tightly linked on the same chromosome show:
| 1. | Very high recombination | 2. | Independent assortment |
| 3. | Very low recombination | 4. | 50 % recombination |
Subtopic: Recombination & Gene Mapping |
87%
Level 1: 80%+
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The progeny of a dihybrid test cross AaBb x aabb show the following genotypes: AaBb 160, Aabb 460, aaBb 440, aabb 140. The recombination frequency between the two loci is:
| 1. | 12.5 % | 2. | 25 % |
| 3. | 15 % | 4. | 30 % |
Subtopic: Recombination & Gene Mapping |
64%
Level 2: 60%+
Hints
Consider three genes: X, Y, and Z. The recombination frequency between X-Y, X-Z, and Y-Z gene pairs was found to be 50%, 25%, and 50%, respectively. What would be the right inference?
| 1. | genes X and Y are on the same chromosome |
| 2. | genes X and Z are on different chromosomes |
| 3. | genes Y and Z are on different chromosomes |
| 4. | All three genes are located on the same chromosome |
Subtopic: Recombination & Gene Mapping |
58%
Level 3: 35%-60%
Hints
When preparing genetic map using recombination data, it is assumed that 1% of crossing over equals:
1. one map unit.
2. two map units.
3. five two map units.
4. ten map units.
1. one map unit.
2. two map units.
3. five two map units.
4. ten map units.
Subtopic: Recombination & Gene Mapping |
83%
Level 1: 80%+
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