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Q. No.Which one of the following symbols represents mating between relatives in human pedigree analysis?
1.
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2.
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3.
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4.
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Subtopic: Pedigree Analysis: Basics |
88%
From NCERT
NEET - 2023
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Match List - I with List - II
Choose the correct answer from the options given below:
| List - I | List - II | ||
| (Type of cross) | (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 |
82%
From NCERT
NEET - 2023
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A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?
1. 30 produced violet and 10 produced white flowers
2. 20 produced violet and 20 produced white flowers.
3. All 40 produced violet flowers
4. All 40 produced white flowers
1. 30 produced violet and 10 produced white flowers
2. 20 produced violet and 20 produced white flowers.
3. All 40 produced violet flowers
4. All 40 produced white flowers
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
68%
From NCERT
NEET - 2023
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In which disorder, change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine?
| 1. | Thalassemia | 2. | Sickle cell anemia |
| 3. | Haemophilia | 4. | Phenylketonuria |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
84%
From NCERT
NEET - 2023
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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 |
From NCERT
NEET - 2023
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Select the correct statements about sickle cell anemia:
Choose the correct answer from the options given below:
| A: | There is a change in the gene for beta-globin |
| B: | In beta-globin, there is a valine in place of Lysine |
| C: | It is an example of point mutation |
| D: | In the normal gene, U is replaced by A |
Choose the correct answer from the options given below:
| 1. | (B), (C) and (D) only | 2. | (B) and (D) only |
| 3. | (A), (B) and (D) only | 4. | (A) and (C) only |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
80%
From NCERT
NEET - 2023
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Select the correct statement/s with respect to mechanism of sex determination in Grasshopper.
Choose the correct answer from the options given below:
| A: | It is an example of female heterogamety |
| B: | Male produces two different types of gametes either with or without X chromosomes. |
| C: | Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. |
| D: | All eggs bear an additional X chromosome besides the autosomes. |
| 1. | (B) and (D) only | 2. | (A), (C) and (D) only |
| 3. | (A) only | 4. | (A) and (C) only |
Subtopic: Sex Determination |
75%
From NCERT
NEET - 2023
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Given below are two statements:
| Assertion (A): | In Mendelian experiments, phenotype of F1 heterozygote is exactly like the dominant parent in appearance. |
| Reason (R): | In a pair of dissimilar factors, one dominates the other while other factor is recessive. |
| 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. |
Subtopic: Monohybrid Cross: 1 |
80%
From NCERT
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Given below are two statements:
| Assertion (A): | The original phenotype is due to dominant allele and the recessive phenotype is due to modified allele. |
| Reason (R): | The dominant allele produces functional enzyme and the modified alleles generally produce non-functional or no enzyme at all. |
| 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. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
73%
From NCERT
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Given below are two statements:
| Assertion (A): | When \(I^A\) and \(I^B \) are present together, they both express their own types of sugars. |
| Reason (R): | Alleles \(I^A\) and \(I^B \) show incomplete dominance. |
| 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. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding | Co-dominance |
74%
From NCERT
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