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Q. No.Which is the most common mechanism of genetic variation in the population of a sexually-reproducing organism?
1. Chromosomal aberrations
2. Genetic drift
3. Recombination
4. Transduction
Subtopic: Recombination Gene Mapping |
84%
Level 1: 80%+
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Morgan observed that the genes for white eyes (w) and yellow body (y) in Drosophila showed only 1.3% recombination, while white eyes (w) and miniature wings (m) showed 37.2% recombination. What can be inferred?
| 1. | Genes w and y are located on different chromosomes |
| 2. | Genes w and y are very close on the same chromosome |
| 3. | Genes w and m show complete linkage with no crossing over |
| 4. | Gene w is located exactly midway between genes y and m |
Subtopic: Linkage | Recombination Gene Mapping |
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In a test cross between F1 heterozygote and homozygous recessive parent, if the offspring ratio is not 1:1, it indicates:
| 1. | Independent assortment of genes |
| 2. | Linkage between genes |
| 3. | Multiple allelism |
| 4. | Epistatic interactions |
Subtopic: Linkage | Recombination Gene Mapping |
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