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Q. No.Which of the following are correct differences between sickle cell anaemia and thalassemia?
Sickle Cell Anaemia
Thalassemia
I
Mode of inheritance
Autosomal recessive
Sex linked recessive
II
Cause
Substitution of valine by glutamic acid due to a single base substitution at the sixth codon of the beta globin chain
Mutation or deletion of genes located on chromosomes 11 or 16
III
Effect on haemoglobin
Qualitative – incorrectly functioning globin
Quantitative – synthesis of too few haemoglobin molecules
1. Only I and II
2. Only I
3. I, II and III
4. Only III
Subtopic: Mendelian Disorders: Sickle Cell Anemia | Mendelian Disorders | Mendelian Disorders: Thalassemia |
74%
From NCERT
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Failure of segregation of chromatids during cell division cycle results in anuploidy. Given below are some important aneuploidies seen in humans. Identify the ones which are correctly matched to their description:
1. Only II and III
2. Only I
3. I, II and III
4. Only II
| I. | Down’s syndrome | Trisomy 21; Simian palmar crease, Furrowed tongue, Mental retardation |
| II. | Klinefelter’s syndrome | 47,XXY; Genetically female, gynaecomastia and sterility |
| III. | Turner’s syndrome | 45, XO; genetically male, Rudimentary ovaries, lack of secondary sexual characters |
2. Only I
3. I, II and III
4. Only II
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
64%
From NCERT
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Who coined the term linkage to describe physical association of genes on a chromosome?
1. Sutton and Boveri
2. Bateson and Punnet
3. T. H. Morgan
4. Watson and Crick
1. Sutton and Boveri
2. Bateson and Punnet
3. T. H. Morgan
4. Watson and Crick
Subtopic: Understanding Linkage | Linkage Types |
87%
From NCERT
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What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?
1. 100%
2. 56.25%
3. 18.75 %
4. 9%
1. 100%
2. 56.25%
3. 18.75 %
4. 9%
Subtopic: Dihybrid Cross: General Consideration | Dihybrid Cross: Details |
70%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Mendel's law of independent assortment holds good for genes that are located closely on the same chromosome. |
| Reason (R): | Closely located genes assort independently. |
In the light of the above statements, choose the correct answer from the options given below:
| 1. | (A) is not correct and (R) is not correct |
| 2. | Both (A) and (R) are correct and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are correct but (R) is not the correct explanation of (A) |
| 4. | (A) is correct and (R) is not correct |
Subtopic: Dihybrid Cross: Details |
70%
From NCERT
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What will be the ploidy of endosperm of a seed produced after crossing tetraploid female plant with tetraploid male plant?
1. Pentaploid
2. Hexaploid
3. Diploid
4. Triploid
1. Pentaploid
2. Hexaploid
3. Diploid
4. Triploid
Subtopic: Non - Disjunction & Aneuploidy |
76%
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The 'Inheritance of blood groups' in humans is not an example of:
a. Dominance
b. Co-dominance
c. Multiple allelism
d. Incomplete dominance
e. Polygenic inheritance
1. a and b only
2. c, d and e only
3. d and e only
4. b, c and d only
a. Dominance
b. Co-dominance
c. Multiple allelism
d. Incomplete dominance
e. Polygenic inheritance
1. a and b only
2. c, d and e only
3. d and e only
4. b, c and d only
Subtopic: Co-dominance |
82%
From NCERT
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The phenomenon of pleiotropism refers to:
| 1. | more than two genes affecting a single character. |
| 2. | presence of several alleles of a single gene controlling a single crossover. |
| 3. | presence of two alleles, each of the two genes controlling a single trait. |
| 4. | a single gene affecting multiple phenotypic expressions. |
Subtopic: Polygenic Inheritance & Pleiotropy |
78%
From NCERT
NEET - 2023
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Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:
| 1. | Henking | 2. | Thomas Hunt Morgan |
| 3. | Sutton and Boveri | 4. | Alfred Sturtevant |
Subtopic: Understanding Linkage | Linkage Types | Recombination & Gene Mapping |
71%
From NCERT
NEET - 2023
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Which of the following statements are correct about Klinefelter's Syndrome?
Choose the correct answer from the options given below:
| A. | This disorder was first described by Langdon Down (1866). |
| B. | Such an individual has overall masculine development. However, the feminine development is also expressed. |
| C. | The affected individual is short statured. |
| D. | Physical, psychomotor and mental development is retarded. |
| E. | Such individuals are sterile. |
| 1. | A and E only | 2. | A and B only |
| 3. | C and D only | 4. | B and E only |
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
81%
From NCERT
NEET - 2023
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