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Q. No.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 |
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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 |
Subtopic: Dihybrid Cross Analysis |
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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 the (R) is the correct explanation of the (A) |
| 2. | Both (A) and (R) are True but the (R) is not the correct explanation of the (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
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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 |
From NCERT
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Subtopic: Sex Determination | Sex Determination: Further Considerations |
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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 |
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From NCERT
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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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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.
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 |
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