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Q. No.In Pisum sativum, the flower position may be axial (allele A) or terminal (allela a). What would be the percentage of the offspring with respect to axial flower position, if a cross is made between parents \(Aa \times aa\) ?
1. 25%
2. 50%
3. 75%
4. 100%
Subtopic: Monohybrid Cross: Further Understanding |
85%
From NCERT
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In humans, rolling of tongue is an autosomal dominant trait (R). In a family both the parents have the trait of rolling tongue but their daughter does not show the trait, whereas the sons have the trait of rolling of tongue.
The genotypes of the family would be:
The genotypes of the family would be:
| Mother | Father | Daughter | Son | |
| 1. | Rr | Rr | rr | rr |
| 2. | Rr | Rr | rr | RR |
| 3. | rr | Rr | RR | rr |
| 4. | RR | rr | Rr | Rr |
Subtopic: Pedigree Analysis: More Examples |
81%
From NCERT
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Study the pedigree analysis of human given below and identify the type of inheritance along with an example :
1. Sex-linked recessive, Haemophilia
2. Sex-linked dominant, Vitamin D resistant rickets
3. Autosomal recessive, Sickle-cell anaemia
4. Autosomal dominant, Myotonic dystrophy
1. Sex-linked recessive, Haemophilia
2. Sex-linked dominant, Vitamin D resistant rickets
3. Autosomal recessive, Sickle-cell anaemia
4. Autosomal dominant, Myotonic dystrophy
Subtopic: Pedigree Analysis: More Examples |
67%
From NCERT
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Possibility of the blood groups of the children in a family where the father is heterozygous for blood group 'A' and the mother is heterozygous for blood group 'B', would be :
1. Blood groups 'A','B'
2. Blood groups 'A','B','O'
3. Blood groups 'AB','O'
4. Blood groups 'A','B','AB','O'
1. Blood groups 'A','B'
2. Blood groups 'A','B','O'
3. Blood groups 'AB','O'
4. Blood groups 'A','B','AB','O'
Subtopic: Co-dominance |
85%
From NCERT
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The correct statement with respect to Thalassemia in humans is:
1. \(\alpha -\)Thalassemia is controlled by a single gene HBB.
2. The gene for \(\alpha -\)Thalassemia is located on chromosome-16.
3. \(\beta -\)Thalassemia is controlled by two closely linked genes HBA-1 and HBA-2.
4. In \(\beta-\)Thalassemia the production of \(\alpha -\)globin chain is affected.
1. \(\alpha -\)Thalassemia is controlled by a single gene HBB.
2. The gene for \(\alpha -\)Thalassemia is located on chromosome-16.
3. \(\beta -\)Thalassemia is controlled by two closely linked genes HBA-1 and HBA-2.
4. In \(\beta-\)Thalassemia the production of \(\alpha -\)globin chain is affected.
Subtopic: Mendelian Disorders: Thalassemia |
82%
From NCERT
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Chromosomal aberrations are caused by:
1. Change in the structure of the gene
2. Change in the number of chromosomes
3. Change in the arrangement or position of genes
4. Change in the number or arrangement of genes in the chromosomes
1. Change in the structure of the gene
2. Change in the number of chromosomes
3. Change in the arrangement or position of genes
4. Change in the number or arrangement of genes in the chromosomes
Subtopic: Non - Disjunction & Aneuploidy |
55%
From NCERT
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1:2:1 phenotypic and genotypic ratio is found in:
1. Complementary genes.
2. Pseudo alleles.
3. Blending inheritance
4. Multiple alleles.
1. Complementary genes.
2. Pseudo alleles.
3. Blending inheritance
4. Multiple alleles.
Subtopic: Monohybrid Cross: Further Understanding |
53%
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Possibilities of the blood groups of the children in a family where the father is heterozygous for blood group A and the mother is heterozygous for blood group B would be:
1. Blood Group A and B
2. Blood Group A, B and O
3. Blood Group AB and O
4. Blood Group A, B, AB and O
1. Blood Group A and B
2. Blood Group A, B and O
3. Blood Group AB and O
4. Blood Group A, B, AB and O
Subtopic: Co-dominance |
85%
From NCERT
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| Assertion (A): | Turner's syndrome is generally not found in males. |
| Reason (R): | The disorder occurs due to monosomy. |
| 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. | (A) is false but (R) is true. |
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
From NCERT
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Consider a test cross between a homozygous recessive yellow-seeded plant with a plant having an unknown seed. 50% of the offspring in the F1 generation have yellow seeds and 50% have green seeds.
Which of the following statements is/are TRUE about the cross?
1. The unknown seed is homozygous recessive for green.
2. The unknown seed is heterozygous for green.
3. All the offspring in the F2 generation will have green seeds.
4. All the offspring in the F2 generation will have yellow seeds.
1. Only 1.
2. Only 2
3. Only 1 and 4.
4. Only 2 and 3.
Which of the following statements is/are TRUE about the cross?
1. The unknown seed is homozygous recessive for green.
2. The unknown seed is heterozygous for green.
3. All the offspring in the F2 generation will have green seeds.
4. All the offspring in the F2 generation will have yellow seeds.
1. Only 1.
2. Only 2
3. Only 1 and 4.
4. Only 2 and 3.
Subtopic: Monohybrid Cross: Further Understanding |
73%
From NCERT
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