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Q. No.In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
1. G G G
2. A A G
3. G A A
4. G U G
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
94%
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Person having genotype IA IB would show the blood group as AB. This is because of:
1. Pleiotropy
2. Co-dominance
3. Segregation
4. Incomplete dominance
1. Pleiotropy
2. Co-dominance
3. Segregation
4. Incomplete dominance
Subtopic: Co-dominance |
95%
From NCERT
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Subtopic: Sex Determination |
89%
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A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
1. TT and Tt
2. Tt and Tt
3. TT and TT
4. Tt and tt
1. TT and Tt
2. Tt and Tt
3. TT and TT
4. Tt and tt
Subtopic: Monohybrid Cross: 1 |
77%
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Which of the following statements is the most appropriate for sickle cell anaemia?
1. It cannot be treated with iron supplements
2. It is a molecular disease
3. It confers resistance to acquiring malaria
4. All of the above
1. It cannot be treated with iron supplements
2. It is a molecular disease
3. It confers resistance to acquiring malaria
4. All of the above
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
69%
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In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
| 1. | The alleles of two genes are interacting with each other |
| 2. | It is a multigenic inheritance |
| 3. | It is a case of multiple allelism |
| 4. | The alleles of two genes are segregating independently. |
Subtopic: Dihybrid Cross Analysis |
86%
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Which of the following will not result in variations among siblings?
1. Independent assortment of genes
2. Crossing over
3. Linkage
4. Mutation
1. Independent assortment of genes
2. Crossing over
3. Linkage
4. Mutation
Subtopic: Linkage |
67%
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Mendel’s Law of independent assortment holds good for genes situated on the:
| 1. | non-homologous chromosomes |
| 2. | homologous chromosomes |
| 3. | extra nuclear genetic element |
| 4. | same chromosome |
Subtopic: Law of Segregation and Law of Independent Assortment |
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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
1. multiple allelism
2. mosaicism
3. pleiotropy
4. polygeny
Subtopic: Polygenic Inheritance & Pleiotropy |
89%
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In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
Subtopic: Sex Determination |
83%
From NCERT
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