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Q. No.The F phenotypic ratio of a dihybrid cross is?
| 1. | 1 : 1 : 1 : 1 | 2. | 1 : 1 |
| 3. | 9 : 3 : 3 : 1 | 4. | 1 : 4 : 6: 4 : 1 |
Subtopic: Â Dihybrid Cross: General Consideration |Â Dihybrid Cross: Details |
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A dihybrid cross yields a phenotypic ratio of 9 : 3 : 3 : 1 in F2 progeny. Most likely, the two genes:
| 1. | are assorting independently |
| 2. | are tightly linked on an autosome |
| 3. | are linked to a sex chromosome |
| 4. | control the same trait |
Subtopic: Â Dihybrid Cross: General Consideration |
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When studying an inherited phenomenon, a geneticist discovers a phenotypic ratio of 9 :3 : 3 : 1 among offspring. This means that it is a dihybrid cross where the two genes are
| 1. | completely linke |
| 2. | incompletely linked |
| 3. | independently assorting |
| 4. | epistatic |
Subtopic: Â Dihybrid Cross Analysis |Â Dihybrid Cross: General Consideration |
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In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
| 1. | Only round seeds with green cotyledons |
| 2. | Only wrinkled seeds with yellow cotyledons |
| 3. | Only wrinkled seeds with green cotyledons |
| 4. | Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons |
Subtopic: Â Dihybrid Cross Analysis |Â Dihybrid Cross: General Consideration |
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Select the correct statement from the ones given below with respect to dihybrid cross.
| 1. | Tightly linked genes on the same chromosomes show very few recombinations. |
| 2. | Tightly linked genes on the same chromosome show higher recombinations. |
| 3. | Genes far apart on the same chromosome show very few recombinations. |
| 4. | Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones. |
Subtopic: Â Dihybrid Cross Analysis |Â Dihybrid Cross: General Consideration |
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