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Q. No.In polygenic inheritance:
1. traits have distinct alternate forms.
2. the expression of the genes is immune to the effects of the environment.
3. the phenotype reflects the contribution of each allele.
4. a single gene can exhibit multiple phenotypic expression.
Subtopic: Polygenic Inheritance & Pleiotropy |
61%
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Identify the incorrect statement regarding mechanism of sex determination in varied organisms:
1. Male honeybees do not have a father and cannot have sons, but have a grandfather and can have grandsons.
2. Male grasshoppers have odd number of chromosomes in their somatic cells while the female grasshoppers have even number.
3. The females are heterogametic in birds.
4. If a couple has a daughter, they will have a son in next pregnancy as there is 50 percent probability of either a male or a female child in each pregnancy.
1. Male honeybees do not have a father and cannot have sons, but have a grandfather and can have grandsons.
2. Male grasshoppers have odd number of chromosomes in their somatic cells while the female grasshoppers have even number.
3. The females are heterogametic in birds.
4. If a couple has a daughter, they will have a son in next pregnancy as there is 50 percent probability of either a male or a female child in each pregnancy.
Subtopic: Sex Determination |
55%
From NCERT
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Which of the following pedigrees can be due to oculocutaneous albinism, an autosomal recessive condition?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Pedigree Analysis: More Examples |
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Which of the following are correct differences between sickle cell anaemia and thalassemia?
1. Only I and II
2. Only I
3. I, II and III
4. Only III
| 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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