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Q. No.Which of the following are characteristics of polygenic traits?
1.
A single gene controls multiple phenotypes.
2.
Phenotypes show a continuous range of variation.
3.
Environment influences the expression of the trait.
4.
Genes contributing to the trait show codominance.
Select the correct answer from the options below:
1. 1, 3
2. 2, 3
3. 2, 3, 4
4. 1, 2, 3, 4
Subtopic: Polygenic Inheritance & Pleiotropy |
Level 3: 35%-60%
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Which of the following is the best definition of a mutation?
| 1. | A mutation is a permanent change in DNA. |
| 2. | A mutation is a permanent change in DNA that is harmful to an organism. |
| 3. | A mutation is a permanent change in the structure of intra-cellular organelles caused by changes in DNA/RNA. |
| 4. | A mutation is a permanent change in chromosomal structure caused by DNA/RNA changes. |
Subtopic: Mutation |
Level 4: Below 35%
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Consider the given two statements:
| Assertion (A): | Polygenic traits are quantitative because they involve multiple genes. |
| Reason (R): | In such traits the genes involved have more than two alleles. |
| 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: Polygenic Inheritance & Pleiotropy |
Level 3: 35%-60%
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Turner's syndrome is caused by:
1. Non-disjunction of autosomes.
2. Non-disjunction of sex chromosomes.
3. Deletion of part of a sex chromosome.
4. Translocation of chromosome parts.
1. Non-disjunction of autosomes.
2. Non-disjunction of sex chromosomes.
3. Deletion of part of a sex chromosome.
4. Translocation of chromosome parts.
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
50%
Level 3: 35%-60%
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What proportion of the progeny of a cross AaBb X AaBb [assume complete dominance and independent assortment] will be homozygous at least at one of the two loci?
1. 1/4
2. 9/16
3. 6/16
4. 3/4
1. 1/4
2. 9/16
3. 6/16
4. 3/4
Subtopic: Dihybrid Cross Analysis |
Level 3: 35%-60%
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In honey bees, the sex of an individual is determined by the number of chromosome sets it possesses. Which of the following scenarios would most likely disrupt normal sex determination in a honey bee population?
| 1. | A mutation in the queen bee that causes her to lay diploid eggs that develop without fertilization. |
| 2. | Increased production of royal jelly, leading to the development of more queen bees. |
| 3. | A mutation in drone bees that allows them to produce sperm with a different chromosome count. |
| 4. | Introduction of a new species of bee that competes for the same food sources |
Subtopic: Sex Determination |
54%
Level 3: 35%-60%
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Consider the following statements about linked genes:
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
| I: | Linked genes are always found on different chromosomes. |
| II: | Recombination between linked genes does not occur. |
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
Subtopic: Linkage |
56%
Level 3: 35%-60%
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Why is the father responsible for determining the sex of the child?
| 1. | Because the father's sperm determines the zygote's sex chromosome composition. |
| 2. | Because the father's genetic material activates sex-determining genes. |
| 3. | Because the mother always provides an X chromosome. |
| 4. | Because the father's phenotype influences the child's sex. |
Subtopic: Sex Determination |
60%
Level 2: 60%+
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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 |
62%
Level 2: 60%+
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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 |
58%
Level 3: 35%-60%
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