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Q. No.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
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 |
75%
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 |
80%
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 |
78%
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 |
57%
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 |
From NCERT
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The pedigree shown below, most likely, exhibits the inheritance of a/an:
1. Autosomal recessive trait
2. Autosomal dominant trait
3. X linked recessive trait
4. X linked dominant trait
1. Autosomal recessive trait
2. Autosomal dominant trait
3. X linked recessive trait
4. X linked dominant trait
Subtopic: Pedigree Analysis: Problem Solving |
53%
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Mendel published his work on inheritance of characters in 1865 but for several reasons, it remained unrecognised till 1900. These reasons included all the following except:
| 1. | Communication was not easy in those days. |
| 2. | His concept of genes (or factors, in Mendel’s words) as stable and discrete units that controlled the expression of traits and, of the pair of alleles which did not ‘blend’ with each other, was not accepted by his contemporaries as an explanation for the apparently continuous variation seen in nature. |
| 3. | Mendel’s approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time. |
| 4. | Although Mendel’s provided correct physical proof for the existence of unit factors as discrete entities, his explanations could mot convince others. |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
77%
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