What percent of F2 progeny of a typical Mendelian monohybrid cross are expected to be true-breeding?
1.
25
2.
50
3.
75
4.
100
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
73%
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Which law is based on the fact that the alleles do not show ant blending and that both the characters are recovered as such in the F2 generation though one of these is not seen at the F1 stage?
1. Law of dominance
2. Law of segregation
3. Law of independent assortment
4. Law of linkage
1. Law of dominance
2. Law of segregation
3. Law of independent assortment
4. Law of linkage
Subtopic: Law of Segregation and Law of Independent Assortment |
70%
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In a cross AaBb X aabb [assuming independent assortment], what fraction of progeny are expected to be AaBb?
1. ¼
2. 1/3
3. ½
4. 2/3
1. ¼
2. 1/3
3. ½
4. 2/3
Subtopic: Dihybrid Cross Analysis | Dihybrid Cross: General Consideration |
76%
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When the two genes in a dihybrid cross are situated on the same chromosome,
| 1. | the proportion of parental gene combinations are much lower than the non-parental type |
| 2. | the proportion of parental gene combinations are much higher than the non-parental type |
| 3. | the proportion of parental gene combinations and the non-parental type is equal |
| 4. | the two genes will always assort independently |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Recombination & Gene Mapping |
81%
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Select the genotype amongst the given genotypes which will result in lightest skin colour in humans:
1. AAbbCC
2. AABBCc
3. aaBBCC
4. AaBbCc
Subtopic: Polygenic Inheritance & Pleiotropy |
78%
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Subtopic: Sex Determination | Sex Determination: Further Considerations |
72%
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Which of the following is not aneuploidy?
1. Down’s syndrome
2. Klinefelter’s syndrome
3. Turner’s syndrome
4. Phenylketonuria
1. Down’s syndrome
2. Klinefelter’s syndrome
3. Turner’s syndrome
4. Phenylketonuria
Subtopic: Mendelian Disorders | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
87%
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Which of the following is a dominant trait in Pisum sativum?
| 1. | Yellow pod colour | 2. | Green seed colour |
| 3. | Axial flower position | 4. | Constricted pod shape |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 | Monohybrid Cross: 1 |
83%
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A pure tall plant is crossed with a hybrid tall plant [tall completely dominant over dwarf]. What proportion of progeny is expected to be dwarf?
1. 0
2. ½
3. ¼
4. ¾
1. 0
2. ½
3. ¼
4. ¾
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
81%
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The strength of linkage between two genes will be:
1. higher if the genes are farther from each other
2. higher if the genes are closer to each other
3. higher if gametic coupling is present
4. higher if gametic repulsion is present
Subtopic: Understanding Linkage | Recombination & Gene Mapping |
84%
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