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Q. No.The figure shows the diagrammatic representation of a test cross. Based on the results shown, what would be true?
Statement I:
In situation A, the plant with the dominant phenotype [genotype unknown] must be homozygous dominant.
Statement II:
In situation B, the plant with the dominant phenotype [genotype unknown] must be heterozygous.
1. Only Statement I
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
Subtopic: Monohybrid Cross: 1 |
78%
Level 2: 60%+
Hints
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 most appropriate answer from the options given below :
| Assertion (A): | Dominance is not an autonomous feature of a gene or the product that it has information for. |
| Reason (R): | The frequency of a gene or an allele in a population is ultimately decided by factors such as natural selection. |
| 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: Dominance Deviation from Mendel: 1 |
Level 3: 35%-60%
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The given figure shows meiosis and germ cell formation in a cell with four chromosomes and segregation when germ cells are formed. A and B would, respectively, be:
1. Anaphase I and Metaphase II
2. Anaphase I and Anaphase II
3. Metaphase I and Anaphase II
4. Metaphase I and Metaphase II
1. Anaphase I and Metaphase II
2. Anaphase I and Anaphase II
3. Metaphase I and Anaphase II
4. Metaphase I and Metaphase II
Subtopic: Chromosomal Basis of Inheritance: Introduction |
66%
Level 2: 60%+
Hints
The figure shows the results of two dihybrid crosses conducted by Morgan where X and Y, respectively, are the percentages of parental and recombinants forms in Cross A and Cross B. Identify the correct statements:
1. Only Statement I
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
| Statement I: | X will be parental types (98.7%) and recombinant types (1.3%); Y will be parental types (62.8%) and recombinant types (37.2%) |
| Statement II: | The strength of linkage is inversely proportional to the distance between the genes located on the same chromosome. |
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
Subtopic: Dihybrid Cross: Details |
85%
Level 1: 80%+
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Human skin colour is a polygenic trait controlled by:
| 1. | 2 genes | 2. | 3 genes |
| 3. | 4 genes | 4. | 6 genes |
Subtopic: Polygenic Inheritance & Pleiotropy |
76%
Level 2: 60%+
Hints
A male with genotype AABBCC and a very dark complexion mates with a female with genotype aabbcc and a very fair complexion. What is the probability of their progeny being born with an intermediate skin colour type?
1. 6/64
2. 15/64
3. 20/64
4. 1/64
1. 6/64
2. 15/64
3. 20/64
4. 1/64
Subtopic: Polygenic Inheritance & Pleiotropy |
54%
Level 3: 35%-60%
Hints
Identify the number of correct statements:
| I: | Polygenic inheritance takes into account the influence of the environment. |
| II: | In a polygenic trait, the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
| III: | The normal distribution curve is bell-shaped in polygenic inheritance. |
| IV: | It is also known as quantitative inheritance. |
| 1. | 0 | 2. | 1 |
| 3. | 3 | 4. | 4 |
Subtopic: Polygenic Inheritance & Pleiotropy |
72%
Level 2: 60%+
Hints
Consider the given statements:
| I: | Where a single gene can exhibit multiple phenotypic expressions, such a gene is called a pleiotropic gene. |
| II: | The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes. |
| III: | Phenylketonuria is caused by a defect in the gene that codes for the enzyme phenylalanine hydroxylase and manifests itself through phenotypic expression characterised by mental retardation and a reduction in hair and skin pigmentation. |
| 1. | Statement I is correct, Statement II is correct, Statement III is incorrect. |
| 2. | Statement I is incorrect, Statement II is correct, Statement III is incorrect. |
| 3. | Statement I is correct, Statement II is incorrect, Statement III is correct. |
| 4. | Statement I is correct, Statement II is correct, Statement III is correct. |
Subtopic: Polygenic Inheritance & Pleiotropy |
86%
Level 1: 80%+
Hints
The following figure shows the determination of sex by chromosomal differences. Which of the following is/are correctly matched?
| A |  |
 |
| B |  |
 |
| 1. | Only A | 2. | Only B |
| 3. | Both A and B | 4. | Neither A nor B |
Subtopic: Sex Determination |
Level 3: 35%-60%
Hints
The figure shows the mechanism of sex determination in a honey bee. How many of the given statements will be true for the mechanism of sex determination in honey bees?
| I. | The sex determination in honey bee is based on the number of sets of chromosomes an individual receives. |
| II. | An offspring formed from the union of a sperm and an egg develops as a female (queen or worker), and an unfertilised egg develops as a male (drone) by means of parthenogenesis. |
| III. | The males have double the number of chromosomes than that of a female, therefore, the females are haploid having 16 chromosomes and the males are diploid, i.e., having 32 chromosomes. |
| IV. | This is called a haplodiploid sex-determination system. |
| V. | The males produce sperms by mitosis, they do not have a father and thus cannot have sons, but have a grandfather and can have grandsons. |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
Subtopic: Sex Determination |
80%
Level 1: 80%+
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