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Q. No.A woman whose father was colorblind marries a normal man. What are the chances that their son would have colorblindness?
1. 0%
2. 25%
3. 50%
4. 100%
Subtopic: Mendelian Disorders |
73%
From NCERT
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A change in chromosome number, where the changed number is not an exact multiple of the base number N, is called as:
| 1. | Polyteny | 2. | Aneuploidy |
| 3. | Polyploidy | 4. | Euploidy |
Subtopic: Non - Disjunction & Aneuploidy | Chromosomal Disorders |
82%
From NCERT
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Consider the given two statements.
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
| Statement I: | It is not necessary that the dominant allele will be the most common allele in a population. |
| Statement II: | Dominance is not an autonomous feature of an allele. |
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic: Monohybrid Cross: 1 |
80%
From NCERT
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Which of the following best explains a frequency of recombination of 50% in a dihybrid test cross?
| 1. | The two genes are likely to be located on different chromosomes. |
| 2. | All of the offspring have combinations of traits that match one of the two parents. |
| 3. | The genes are located on sex chromosomes. |
| 4. | Abnormal meiosis has occurred. |
Subtopic: Linkage | Recombination Gene Mapping | Recombination & Gene Mapping |
59%
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Which of the following statements correctly describes the difference between incomplete dominance and co-dominance?
| 1. | Incomplete dominance results in progeny not resembling either of the parents, whereas co-dominance results in progeny resembling both parents. |
| 2. | Incomplete dominance involves multiple alleles, while co-dominance does not. |
| 3. | Co-dominance occurs in phenotypes only, while incomplete dominance occurs in genotypes. |
| 4. | Incomplete dominance is a type of sex-linked inheritance, whereas co-dominance occurs in autosomes. |
Subtopic: Dominance Deviation from Mendel: 1 |
98%
From NCERT
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Genes A, B, C, and D are linked. The distances between the genes are:
What is the order of the genes on the chromosome?
1. D B A C
2. D B C A
2. D C B A
4. A B C D
| Relationship | Map Unit |
| D – A | 11 |
| D – B | 7 |
| D – C | 22 |
| B – C | 15 |
| A – B | 4 |
1. D B A C
2. D B C A
2. D C B A
4. A B C D
Subtopic: Recombination Gene Mapping |
93%
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What is the probability of having a child with a medium skin color in humans if both parents are heterozygous (AaBbCc)?
| 1. | 1/64 | 2. | 6/64 |
| 3. | 15/64 | 4. | 20/64 |
Subtopic: Polygenic Inheritance & Pleiotropy |
From NCERT
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Genetic mapping based on recombination studies helps in:
| 1. | Identifying physical locations of genes on a chromosome. |
| 2. | Predicting possible traits in the offspring. |
| 3. | Estimating distances between genes based on the frequency of recombination. |
| 4. | Determining the exact sequence of nucleotides in a gene. |
Subtopic: Recombination & Gene Mapping |
76%
From NCERT
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What does the principle of segregation in genetics state?
| 1. | Alleles separate so that each gamete carries only one allele for each gene. |
| 2. | Genes for different traits can segregate independently during the formation of gametes. |
| 3. | Each allele in a pair segregates into a different sex chromosome. |
| 4. | Phenotypes segregate during gamete formation, leading to genetic variation. |
Subtopic: Law of Segregation and Law of Independent Assortment |
54%
From NCERT
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Consider the given two statements:
| Assertion (A): | The strength of linkage between two genes is directly proportional to the distance between them on the chromosome. |
| Reason (R): | Genes that are farther apart are less likely to be separated by recombination. |
| 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, (R) is False. |
Subtopic: Linkage |
59%
From NCERT
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