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 |
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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 |
71%
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 |
89%
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
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:
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 |
2. Only I and IV
3. Only II and III
4. I, II, III and IV
Subtopic: Sex Determination |
72%
From NCERT
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For a female becoming haemophilic:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | mother of such a female has to be at least a carrier. |
| II: | father of such a female has to be at least a carrier. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Mendelian Disorders: Hemophilia |
70%
From NCERT
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In Pisum sativum, the allele for tallness [T] is completely dominant over the allele for dwarfness [t]. What proportion of the tall progeny of the cross Tt X Tt will be homozygous tall?
| 1. | 1/3 | 2. | 1/4 |
| 3. | 1/2 | 4. | 3/2 |
Subtopic: Monohybrid Cross: 1 |
From NCERT
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A pea plant shows the dominant phenotype. You conduct a single gene test cross to determine the genotype of this pea plant (T = tall, t = short). All progeny of the test cross show the dominant phenotype. The genotype of the plant in question is most likely:
| 1. | TT. | 2. | TTtt. |
| 3. | Tt. | 4. | tt. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
75%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Number of possible phenotypes in ABO blood group system | P | 1 : 2 : 1 |
| B | Number of possible genotypes in ABO blood group system | Q | 3 : 1 |
| C | F2 phenotypic ratio in incomplete dominance | R | 4 |
| D | F2 phenotypic ratio in complete dominance | S | 6 |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Monohybrid Cross: 1 | Dominance Deviation from Mendel: 1 | Dominance Deviation from Mendel: 2 |
90%
From NCERT
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