A low frequency recombination indicates that the genes are:
1. Located far apart from each other
2. Located close to each other
3. Not linked
4. Present on different c
1. Located far apart from each other
2. Located close to each other
3. Not linked
4. Present on different c
Subtopic: Linkage | Recombination Gene Mapping |
78%
From NCERT
NEET - 2022
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Thomas Hunt Morgan's choice of Drosophila melanogaster has been proving to be useful even today. Which of the following has/have continued to make it a most useful species?
1. II and III only
2. I, II, and III only
3. II, III, and IV only
4. I, II, III, and IV
| I. | its four pairs of chromosomes |
| II. | a very large number of visible as well as biochemically mutant phenotypes |
| III. | easy and inexpensive maintenance |
| IV. | short generation time and large number of offspring |
2. I, II, and III only
3. II, III, and IV only
4. I, II, III, and IV
Subtopic: Chromosomal Basis of Inheritance: Introduction |
53%
From NCERT
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Which of the following statements is true for linkage?
| 1. | The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them. |
| 2. | The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 100%. |
| 3. | All of the traits that Mendel studied–seed color, pod shape, flower color, and others–are due to genes linked on the same chromosome. |
| 4. | Linked genes are found on different chromosomes |
Subtopic: Understanding Linkage | Linkage Types |
80%
From NCERT
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Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that
| 1. | new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1. |
| 2. | the mechanism controlling the appearance of traits was different between the F1 and the F2 plants. |
| 3. | traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. |
| 4. | the traits were lost in the F1 due to dominance of the parental traits. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
75%
From NCERT
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In the following questions a statement of assertion (A) is followed by a statement of reason (R).
| Assertion (A): | Organisms lacking one complete chromosome are called monosomics. |
| Reason (R): | Down’s syndrome is an example of monosomy. |
| 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. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
69%
From NCERT
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Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?
1. incomplete dominance
2. multiple alleles
3. pleiotropy
4. epistasis
1. incomplete dominance
2. multiple alleles
3. pleiotropy
4. epistasis
Subtopic: Polygenic Inheritance & Pleiotropy | Mendelian Disorders |
79%
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How would one explain a test cross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?
1. The two genes are closely linked on the same chromosome
2. The two genes are linked but on different chromosomes
3. Recombination did not occur in the cell during meiosis
4. The test cross was improperly performed
1. The two genes are closely linked on the same chromosome
2. The two genes are linked but on different chromosomes
3. Recombination did not occur in the cell during meiosis
4. The test cross was improperly performed
Subtopic: Understanding Linkage | Linkage Types | Recombination & Gene Mapping |
84%
From NCERT
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In a linear chromosome map distances between four loci are -a and b = 20 mu; a and d = 6mu; b and c=8 mu; a and c= 12 mu. What will be the crossover frequency between c and d ?
1. 12%
2. 20%
3. 3%
4. 6%
1. 12%
2. 20%
3. 3%
4. 6%
Subtopic: Chromosomal Basis of Inheritance: Introduction | Linkage Types | Recombination & Gene Mapping |
62%
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Which of the following display female heterogametry?
1. Drosophila melanogaster
2. Apis mellifera
3. Gallus gallus domesticus
4. Periplaneta Americana
1. Drosophila melanogaster
2. Apis mellifera
3. Gallus gallus domesticus
4. Periplaneta Americana
Subtopic: Sex Determination | Sex Determination: Further Considerations |
56%
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In a particular chromosome, the recombination frequency between genes a &c is 5%; b & c is 15%; b &d is 9%; a &b is 20%; c &d is 24% and a & d is 29%. The sequence of genes in a chromosome is
1. a, d, b, c
2. d, b, a, c
3. a, b, c, d
4. a, c, b, d
1. a, d, b, c
2. d, b, a, c
3. a, b, c, d
4. a, c, b, d
Subtopic: Chromosomal Basis of Inheritance: Introduction | Recombination & Gene Mapping |
70%
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