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Q. No.In humans, the condition red-green color blindness is a sex-linked recessive trait. In a family pedigree analysis, you find that two people with normal color vision have a color-blind son. This is possible if the genotypes of the parents are:
| 1. | XcXc and XcY | 2. | XcXc and XCY |
| 3. | XCXC and XcY | 4. | XCXc and XCY |
Subtopic: Â Pedigree Analysis: Basics |
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The pedigree shown below cannot be:
| I. | Autosomal dominant disorder |
| II. | Autosomal recessive disorder |
| III. | Sex-linked dominant disorder |
| IV. | Sex-linked recessive disorder |
| V. | Holandric disorder |
| 1. | I, II, and III only | 2. | I, II, III, and V only |
| 3. | I, III, IV, and V only | 4. | I, II, III, IV and V |
Subtopic: Â Pedigree Analysis: Basics |
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Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character:
| 1. | The parents could not have had a normal daughter for this character |
| 2. | The trait under study could not be colourblindness |
| 3. | The male parent is homozygous dominant |
| 4. | The female parent is heterozygous |
Subtopic: Â Pedigree Analysis: Basics |
AIPMT - 2010
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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: Â Pedigree Analysis: Basics |
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The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in the pedigree analysis is equivalent to:
| 1. | quantitative trait | 2. | Mendelian trait |
| 3. | polygenic trait | 4. | maternal trait |
Subtopic: Â Pedigree Analysis: Basics |
 82%
From NCERT
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The mode of inheritance shown by filled symbols in the given pedigree is most likely:
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
Subtopic: Â Pedigree Analysis: Basics |Â Pedigree Analysis: Problem Solving |
 56%
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