- 1(current)
Q. No.All genes located on the same chromosome:
| 1. | Form different groups depending upon their relative distance |
| 2. | Form one linkage group |
| 3. | Will not from any linkage groups |
| 4. | Form interactive groups that affect the phenotype |
Subtopic: Â Understanding Linkage |Â Linkage Types |
 59%
Level 3: 35%-60%
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If a chiasma forms between the loci of genes A and B in 20 % of the tetrads of an individual of genotype AB/ab, the percentage of gametes expected to be Ab is:
| 1. | 40 | 2. | 20 |
| 3. | 10 | 4. | 5 |
Subtopic: Â Understanding Linkage |Â Linkage Types |Â Recombination & Gene Mapping |
Level 4: Below 35%
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A dihybrid test cross shows a frequency of recombination of 50 %. The best explanation will be:
| 1. | The two genes are likely to be located on different chromosomes |
| 2. | All of the offspring have combinations of traits that match one of the two parents |
| 3. | The genes are located on sex chromosomes |
| 4. | Abnormal meiosis has occurred |
Subtopic: Â Understanding Linkage |Â Linkage Types |
 58%
Level 3: 35%-60%
Hints
Linkage maps:
| 1. | always have a total of 100 map units. |
| 2. | can be used to pinpoint the precise physical position of a gene on a chromosome. |
| 3. | are a genetic map based on recombination frequencies. |
| 4. | reflect the frequency of crossing over between X and Y chromosomes. |
Subtopic: Â Linkage Types |
 72%
Level 2: 60%+
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The frequency of crossing over between any two linked genes will be:
| 1. | Higher if they are recessive |
| 2. | Dependent on how many alleles there are |
| 3. | Determined by their relative dominance |
| 4. | Proportional to the distance between |
Subtopic: Â Understanding Linkage |Â Linkage Types |Â Recombination & Gene Mapping |
 80%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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