The nearer two genes are on a chromosome:
1.
the higher the chance of recombination between them.
2.
the lower the chance of recombination between them.
3.
the lower the chance of both being dominant alleles.
4.
the higher the chance of both being dominant alleles.
Subtopic: Recombination & Gene Mapping |
82%
From NCERT
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Consider the given statements:
| Assertion (A): | Even if a character shows multiple allelism, an individual will only have two alleles for that character. |
| Reason (R): | The somatic cells of an individual have only two chromosomes. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
From NCERT
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All the following are recessive traits in Pisum sativum except:
| 1. | Green pod colour |
| 2. | Green seed colour |
| 3. | Terminal flower position |
| 4. | Constricted pod shape |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
76%
From NCERT
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Sex determination is based on the number of sets of chromosomes an individual receives in:
1. Honeybees
2. Grasshoppers
3. Fruit fly
4. Birds
1. Honeybees
2. Grasshoppers
3. Fruit fly
4. Birds
Subtopic: Sex Determination |
72%
From NCERT
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α Thalassemia is controlled by:
| 1. | two closely linked genes on chromosome 16 |
| 2. | two closely linked genes on chromosome 11 |
| 3. | a single gene on chromosome 11 |
| 4. | a single gene on chromosome 16 |
Subtopic: Mendelian Disorders: Thalassemia |
71%
From NCERT
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The given pedigree shows the inheritance pattern of a rare mutant phenotype (filled-in symbols) in humans. What is the most likely mode of inheritance of the trait?
1. Autosomal recessive
2. Sex-linked recessive
3. Autosomal dominant
4. Sex-linked dominant
1. Autosomal recessive
2. Sex-linked recessive
3. Autosomal dominant
4. Sex-linked dominant
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
From NCERT
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The son of a woman who carries the gene for colour blindness [but herself is not affected]:
| 1. | can never be colour blind |
| 2. | has a 25 per cent chance of being colour blind |
| 3. | has a 50 per cent chance of being colour blind |
| 4. | has a 100 per cent chance of being colour blind |
Subtopic: Mendelian Disorders |
69%
From NCERT
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Which of the following conditions is not a case of aneuploidy?
1. Down’s syndrome
2. Turner’s syndrome
3. Thalassemia
4. Klinefelter’s syndrome
1. Down’s syndrome
2. Turner’s syndrome
3. Thalassemia
4. Klinefelter’s syndrome
Subtopic: Mendelian Disorders: Thalassemia | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
90%
From NCERT
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A man has type AB blood and he marries a woman with type O blood. Two children are born to the couple and they also adopted one child. If child 1 has type A blood, child 2 has type B blood, and child 3 has type O blood, which child was adopted?
| 1. | Child 1 | 2. | Child 2 |
| 3. | Child 3 | 4. | Cannot be determined |
Subtopic: Monohybrid Cross: Further Understanding |
90%
From NCERT
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The number of chromosomes in the male and female is/are not equal in:
I: Humans
II: Honeybees
III: Grasshoppers
IV: Drosophila
1. Only II
2. Only I and IV
3. Only II and III
4. I, II, III and IV
I: Humans
II: Honeybees
III: Grasshoppers
IV: Drosophila
1. Only II
2. Only I and IV
3. Only II and III
4. I, II, III and IV
Subtopic: Sex Determination |
70%
From NCERT
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