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Q. No.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%
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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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Subtopic: Sex Determination | Sex Determination: Further Considerations |
90%
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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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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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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 |
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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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Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
| 1. | Violet flower colour | 2. | Yellow pod colour |
| 3. | Axial flower position | 4. | Tall stem height |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
86%
From NCERT
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The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having:
| 1. | No anitgens A and B on RBCs |
| 2. | Other antigens besides A and B on RBCs |
| 3. | Overdominance of this type on the genes for A and B types |
| 4. | One antibody only - either anti-A or anti-B on the RBCs |
Subtopic: Dominance Deviation from Mendel: 1 |
88%
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Occasionally, a single gene may express more than one effect. The phenomenon is called:
| 1. | multiple allelism | 2. | mosaicism |
| 3. | pleiotropy | 4. | polygeny |
Subtopic: Polygenic Inheritance & Pleiotropy |
88%
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