- 1(current)
Q. No.Subtopic: Linkage |
92%
Level 1: 80%+
NEET - 2015
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Consider the given two statements:
| Assertion (A): | Genes that are linked do not assort independently. |
| Reason (R): | Linked genes are located close to each other on the same chromosome and tend to be inherited together during meiosis, overriding Mendel’s law of independent assortment. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True; (R) is False |
| 4. | (A) is False; (R) is True |
Subtopic: Linkage |
89%
Level 1: 80%+
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Genes which are tightly linked on chromosome show :
1. Very low recombination
2. High recombination
3. Very low parental combination
4. Clear cut independent assortment
Subtopic: Linkage |
87%
Level 1: 80%+
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When the two genes in a dihybrid cross were situated on the same chromosome:
| 1. | the proportion of parental gene combinations were much lower than the non-parental type. |
| 2. | the proportion of parental gene combinations were much higher than the non-parental type. |
| 3. | the proportion of parental gene combinations were equal to the non-parental type. |
| 4. | only the parental gene combinations were seen in the progeny. |
Subtopic: Linkage |
87%
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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