What would not be true regarding Down’s Syndrome?
1.
It is also known as trisomy 21
2.
The parents of the affected individual are usually affected from the disorder.
3.
There is no cure for Down syndrome.
4.
The extra chromosome 21 material may also occur due to a Robertsonian translocation in 2–4% of cases.
Subtopic: Non - Disjunction & Aneuploidy |
65%
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The mode of inheritance shown by filled symbols in the given pedigree is most likely:
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
58%
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A form of aneuploidy with the presence of only one chromosome from a pair is known as:
1. Haploidy
2. Nullisomy
3. Monosomy
4. Trisomy
1. Haploidy
2. Nullisomy
3. Monosomy
4. Trisomy
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
75%
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A point mutation in a sequence of DNA that results in a premature stop codon in the transcribed mRNA is known as:
1. Nonsense
2. Silent
3. Missense
4. Frame shift
1. Nonsense
2. Silent
3. Missense
4. Frame shift
Subtopic: Mutation |
55%
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During Mendel’s investigations into inheritance patterns it was for the first time that:
| 1. | experiments were conducted on garden pea |
| 2. | artificial pollination experiments were carried out |
| 3. | statistical analysis and mathematical logic were applied to problems in biology |
| 4. | all characteristics were passed to the next generation through blending inheritance |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
89%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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