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Q. No.Two genes located on the same autosome in an organism are 70 map unit apart. The recombination frequency between the two genes when a dihybrid cross is performed would be:
1.
100 %
2.
Less than 50 %
3.
25 %
4.
0
Subtopic: Recombination & Gene Mapping |
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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 heterozygous tall pea plant is allowed to self-pollinate. What proportion of tall progeny will be heterozygous tall?
| 1. | ¼ | 2. | 2/3 |
| 3. | ½ | 4. | ¾ |
Subtopic: Monohybrid Cross: 1 |
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In a test cross AaBb X aabb [assuming independent assortment], the ratio of progeny with genotypes AaBb and aabb will be:
1. 1 : 1
2. 3 : 1
3. 1 : 1 : 1 : 1
4. 9 : 1
1. 1 : 1
2. 3 : 1
3. 1 : 1 : 1 : 1
4. 9 : 1
Subtopic: Dihybrid Cross Analysis |
59%
From NCERT
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| Assertion (A): | The genetic sex of an individual with Klinefelter's syndrome is female |
| Reason (R): | Only X-chromosome is present in their genotype |
| 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. | Both (A) and (R) are False |
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
70%
From NCERT
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The trait shown in the given pedigree [symbols have usual meaning] is most likely:
| 1. | Autosomal recessive | 2. | X-linked recessive |
| 3. | Autosomal dominant | 4. | X-linked dominant |
Subtopic: Pedigree Analysis: Problem Solving |
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Study the given diagram and select the correct option:
| 1. | The karyotype is of an individual suffering from Down’s syndrome |
| 2. | The number of autosomes seen is 43 |
| 3. | The genetic sex of this individual must be female |
| 4. | The fertility will be maintained in this individual |
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
51%
From NCERT
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Subtopic: Sex Determination | Sex Determination: Further Considerations |
72%
From NCERT
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One of the crosses conducted by Mendel was a ‘test cross’. This cross can be used to:
| 1. | determine whether the individual is heterozygous or homozygous dominant |
| 2. | determine whether a gene is located on a sex chromosome or an autosome |
| 3. | differentiate between incomplete dominance and codominance |
| 4. | identify linkage between two genes |
Subtopic: Monohybrid Cross: 1 |
91%
From NCERT
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Which of the following is not correct regarding polygenic inheritance?
| 1. | Main mode of non-allelic genes interaction in corresponding gene series is addition of mainly small particular allele contributions. |
| 2. | The effects of allelic substitution at each of the segregating genes are usually relatively small and interchangeable which results that identical phenotype may be displayed by a great variety of genotypes. |
| 3. | The phenotypic expression of the polygenic characters is undergoing considerable modification by environmental influence. |
| 4. | Polygenic characters show a discontinuous rather than continuous distribution. |
Subtopic: Polygenic Inheritance & Pleiotropy |
52%
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