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Q. No.In a monohybrid cross, ¼ of the random fertilisations lead to:
I: Homozygous dominant progeny
II: Homozygous recessive progeny
III: Heterozygous progeny
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Monohybrid Cross: Further Understanding |
68%
From NCERT
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Consider the given two statements:
| Assertion (A): | Mendel self-pollinated the F2 plants and found that dwarf F2 plants continued to generate dwarf plants in F3 and F4 generations. |
| Reason (R): | The genotype of the dwarfs was homozygous. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains Assertion. |
| 3. | Both (A) and (R) are False. |
| 4. | (A) is True but (R) is False. |
Subtopic: Monohybrid Cross: Further Understanding |
61%
From NCERT
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In Antirrhinum majus, how many of the given cross will produce all progeny exhibiting similar phenotypes [symbols carry usual meanings]?
I: \(Rr \times Rr\)
II: \(Rr \times rr\)
III: \(RR \times rr\)
IV: \(Rr \times RR\)
1. 1
2. 2
3. 3
4. 4
I: \(Rr \times Rr\)
II: \(Rr \times rr\)
III: \(RR \times rr\)
IV: \(Rr \times RR\)
1. 1
2. 2
3. 3
4. 4
Subtopic: Monohybrid Cross: Further Understanding |
From NCERT
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Consider the given two statements:
| Assertion: | Female must have the colour blindness gene on both of their X chromosomes to be colour blind. |
| Reason: | Colour blindness is a sex linked dominant trait. |
| 1. | Both Assertion and Reason are true but the Reason does not correctly explain the Assertion. |
| 2. | Both Assertion and Reason are true and the Reason correctly explains the Assertion. |
| 3. | Assertion is false and Reason is also false. |
| 4. | Assertion is true but Reason is false. |
Subtopic: Pedigree Analysis: More Examples |
76%
From NCERT
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Genes that are located on the same chromosome are called as:
1. Duplicate genes
2. Pseudo genes
3. Linked genes
4. Codominant genes
1. Duplicate genes
2. Pseudo genes
3. Linked genes
4. Codominant genes
Subtopic: Understanding Linkage |
93%
From NCERT
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The karyotype shown below is of a person affected with:
1. Klinefelter’s syndrome
2. Turner’s syndrome
3. Down’s syndrome
4. Edward’s syndrome
1. Klinefelter’s syndrome
2. Turner’s syndrome
3. Down’s syndrome
4. Edward’s syndrome
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
79%
From NCERT
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How many of the given statements are correct?
1. Only I
2. Only II and III
3. None
4. I, II and III
| I: | F1 resembled either of the two parents in co-dominance |
| II: | F1 was in-between in complete dominance. |
| III: | F1 generation resembles both parents in incomplete dominance. |
2. Only II and III
3. None
4. I, II and III
Subtopic: Co-dominance |
70%
From NCERT
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Regarding ABO blood group genetics:
I: Three alleles control blood type: A, B, and O.
II: A and B are codominant, while O is recessive.
III: Six genotypes and four phenotypes are possible.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
I: Three alleles control blood type: A, B, and O.
II: A and B are codominant, while O is recessive.
III: Six genotypes and four phenotypes are possible.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Co-dominance |
77%
From NCERT
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Starch synthesis in pea seeds is controlled by one gene. What will be true?
| Statement I: | BB homozygotes produce large starch grains, Bb heterozygotes produce large starch grains and bb homozygotes produce smaller starch grains. |
| Statement II: | BB homozygotes produce round seeds, Bb heterozygotes produce oval seeds and bb homozygotes produce wrinkled seeds. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Co-dominance |
56%
From NCERT
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The physical basis of independent assortment is:
1. Metaphase I of Meiosis I
2. Metaphase II of Meiosis II
3. Anaphase I of Meiosis I
4. Anaphase II of Meiosis II
1. Metaphase I of Meiosis I
2. Metaphase II of Meiosis II
3. Anaphase I of Meiosis I
4. Anaphase II of Meiosis II
Subtopic: Dihybrid Cross: General Consideration |
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