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What phenotypic ratio will be there when selfing of a trihybrid is performed in which two gene pairs are completely dominant and one gene pair is codominant?
- 3:9:1:2:1:3
- 27:9:3:1:3:3:1
- 9:3:3:1:18:6:6:2:9:3:3:1
- 18:6:6:2:1:2:1:2:1
Subtopic: Dihybrid Cross: General Consideration |
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Which one of the following trait is only expressed in the presence of identical allele?
1. Yellow seed
2. Inflated pod
3. Green pod
4. Green seed
Subtopic: Dihybrid Cross: General Consideration |
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In a cross AaBb X aabb [assuming independent assortment], what fraction of progeny are expected to be AaBb?
1. ¼
2. 1/3
3. ½
4. 2/3
1. ¼
2. 1/3
3. ½
4. 2/3
Subtopic: Dihybrid Cross Analysis | Dihybrid Cross: General Consideration |
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While carrying out a dihybrid cross [a mating of two organisms heterozygous for two traits], a phenotype ratio of 9:3:3:1 in the offspring is expected when:
| 1. | the genes are linked [located on the same chromosome |
| 2. | each gene contains two mutations |
| 3. | the gene pairs assort independently during meiosis |
| 4. | the alleles of both genes show either co-dominance or incomplete dominance |
Subtopic: Dihybrid Cross Analysis | Dihybrid Cross: General Consideration |
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Assertion(A): Multiple alleles can be found in an individual.
Reason(R): ABO blood grouping involves three alleles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): ABO blood grouping involves three alleles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Dihybrid Cross: General Consideration |
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Assertion(A): Dihybrid crosses are made based on an assumption that the two genes are following the law of independent assortment.
Reason(R): Four types of phenotypic combinations are possible in the gametes of each parent in such a cross.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): Four types of phenotypic combinations are possible in the gametes of each parent in such a cross.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Dihybrid Cross: General Consideration |
Level 3: 35%-60%
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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
1. are assorting independently
2. are tightly linked on an autosome
3. are linked to a sex chromosome
4. control the same trait
Subtopic: Dihybrid Cross: General Consideration |
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I (Type of cross) |
List-II (Phenotypic ratio) |
||
| (A) | Monohybrid cross | (I) | 1:1 |
| (B) | Dihybrid cross | (II) | 1:2:1 |
| (C) | Incomplete dominance | (III) | 3:1 |
| (D) | Test cross | (IV) | 9:3:3:1 |
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | IV | II | I |
| 2. | II | IV | III | I |
| 3. | II | III | IV | I |
| 4. | IV | III | I | II |
Subtopic: Monohybrid Cross: Further Understanding | Dihybrid Cross: General Consideration | Dihybrid Cross: Details | Dominance Deviation from Mendel: 1 | Dominance Deviation from Mendel: 2 |
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A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F2 generation?
| 1. | 9 | 2. | 16 |
| 3. | 4 | 4. | 6 |
Subtopic: Dihybrid Cross: General Consideration |
Level 3: 35%-60%
NEET - 2023
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Which of the following terms, as related to genetics, refers to having inherited the same versions (alleles) of a genomic marker from each biological parent?
1. Homologous
2. Heterologous
3. Homozygous
4. Heterozygous
1. Homologous
2. Heterologous
3. Homozygous
4. Heterozygous
Subtopic: Monohybrid Cross: 1 | Dihybrid Cross: General Consideration |
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