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Q. No.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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Given below are two statements:
| Assertion (A): | A recessive character that is not expressed in heterozygous condition can express when it becomes homozygous. |
| Reason (R): | Characters segregate during the formation of gametes. |
| 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 | Law of Segregation |
62%
From NCERT
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Given below are two statements:
| Assertion (A): | Externally it is not possible to distinguish between the pea plants with the genotypes TT or Tt regarding their heights. |
| Reason (R): | Due to the dominance of one trait over the other, 3/4th of the F2 plants in Mendelian monohybrid cross were tall. |
| 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 |
63%
From NCERT
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Given below are two statements:
| Assertion (A): | In each pregnancy there is always 50 percent probability of either a male or a female child. |
| Reason (R): | Genetic makeup of the sperm determines the sex of a child. |
| 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: Sex Determination |
From NCERT
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