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Q. No.Total number of autosomes will be the same in:
I.
Male and female humans
II.
Male and female birds
III.
Male and female Drosophila
IV.
Male and female grasshopper
1. Only I, II, and III
2. Only I, II, and IV
3. Only II, III, and IV
4. I, II, III, and IV
Subtopic: Sex Determination |
64%
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After analysis of results drawn from his experiments with pea plants, Mendel concluded:
| 1. | There is considerable genetic variation in garden peas. |
| 2. | Traits are inherited in discrete units, and are not the results of "blending." |
| 3. | Recessive genes occur more frequently in the F1 than do dominant ones. |
| 4. | Genes are composed of DNA. |
Subtopic: Law of Segregation and Law of Independent Assortment |
87%
From NCERT
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The genetic change shown in the given figure shows the pathogenesis of:
| 1. | Phenylketonuria | 2. | Cystic fibrosis |
| 3. | Sickle cell anemia | 4. | Thalassemia |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
89%
From NCERT
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Genetics, an important branch of biology, is best defined as:
| 1. | The study of the transmission of traits from parent to offspring. |
| 2. | The study of genes and traits defined by genes. |
| 3. | The study of DNA. |
| 4. | The study of variation between members of a species. |
Subtopic: Introduction to Genetics: 1 |
From NCERT
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Pedigree analysis rather than conventional methods are used to study genetic traits because:
| I: | Number of progeny is limited |
| II: | Choice matings are not possible |
| III: | Sexual dimorphism is seen in humans |
1. I only
2. II only
3. III only
4. Both I and II
Subtopic: Pedigree Analysis: Basics |
79%
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The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:
| 1. | it revealed new and unanticipated features of Mendel’s pea plant varieties. |
| 2. | it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. |
| 3. | it allowed scientists to see the DNA present within chromosomes. |
| 4. | it led to the discovery of mitochondria. |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
81%
From NCERT
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Subtopic: Sex Determination | Sex Determination: Further Considerations |
90%
From NCERT
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It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:
| 1. | The sex is determined by the type of sperm fertilizing the egg |
| 2. | The sex is determined by the type of egg fertilizing the sperm |
| 3. | The sex is determined by the hormones produced by the fetus |
| 4. | The sex is determined by God’s Will |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
90%
From NCERT
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In Phenylketonuria,
| I: | Phenylpyruvic acid and other derivatives are accumulated in the brain resulting in mental retardation. |
| II: | These are also excreted through urine because of their poor absorption by the kidney. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both are correct | 4. | Both are incorrect |
Subtopic: Mendelian Disorders |
88%
From NCERT
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Which of the following was not a character studied by Mendel in garden pea?
| 1. | Flower position | 2. | Pod shape |
| 3. | Flower colour | 4. | Pod position |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 | Monohybrid Cross: 1 |
92%
From NCERT
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