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Q. No.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 |
56%
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 |
60%
From NCERT
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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 |
59%
From NCERT
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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 |
55%
From NCERT
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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 |
52%
From NCERT
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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 |
From NCERT
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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 |
From NCERT
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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 |
From NCERT
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In a monohybrid test cross involving F1 heterozygous plants, the expected progeny ratio is:
1. 3 : 1
2. 1 : 1
3. 9 : 3 : 3 : 1
4. All offspring will show the dominant trait
1. 3 : 1
2. 1 : 1
3. 9 : 3 : 3 : 1
4. All offspring will show the dominant trait
Subtopic: Monohybrid Cross: 1 |
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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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