In a flowering plant species, there are only two characters for which contrasting traits are present in the population and these genes are on different chromosomes. If we randomly select a seed from a heap of seeds produced by dihybrid individuals of this population, What would be the probability that the plant produced by this seed would have one dominant and one recessive trait?
1. \(\frac{9}{16 }\)
2. \(\frac{3}{8 }\)
3. \(\frac{1}{2 }\)
4. \(\frac{1}{4 }\)
Subtopic: Dihybrid Cross: General Consideration |
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Test cross is required to know the actual genotype of all of the following phenotypic conditions, except
1. Axial flower position in Pisum
2. Yellow pea seed colour
3. Red flower colour in Antirrhinum
4. Round pea seed shape
1. Axial flower position in Pisum
2. Yellow pea seed colour
3. Red flower colour in Antirrhinum
4. Round pea seed shape
Subtopic: Monohybrid Cross: 1 |
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A father and his son, both have blood group O. Which blood group(s) is/are not possible in the siblings of that son?
1. AB
2. A and B
3. A only
4. B only
1. AB
2. A and B
3. A only
4. B only
Subtopic: Co-dominance |
77%
From NCERT
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If all the three alleles of the gene that controls the blood group in human follow the pattern of codominance, what would be the total number of phenotypes in the population?
1. Twelve
2. Six
3. Eight
4. Four
1. Twelve
2. Six
3. Eight
4. Four
Subtopic: Co-dominance |
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A single gene exhibits multiple phenotypic expression. This statement is true for the genes responsible for
(a) Seed shape in pea
(b) Phenylketonuria in humans
(c) Starch grain size in pea
The correct one(s) is/are
1. One (a)
2. All (a), (b) and (c)
3. Only (b) and (c)
4 Only (b)
(a) Seed shape in pea
(b) Phenylketonuria in humans
(c) Starch grain size in pea
The correct one(s) is/are
1. One (a)
2. All (a), (b) and (c)
3. Only (b) and (c)
4 Only (b)
Subtopic: Polygenic Inheritance & Pleiotropy |
From NCERT
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What percent of plants developed from wrinkled seeds obtained in F2 generation of Mendelian dihybrid cross will produce only wrinkled-yellow seeds by selfing?
1. 12.5%
2. 33.33%
3. 6.25%
4. 25%
1. 12.5%
2. 33.33%
3. 6.25%
4. 25%
Subtopic: Dihybrid Cross Analysis |
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Many of the genes, although they are linked get separated in the coming generations. This is due to
| 1. | Independent assortment of chromosomes |
| 2. | Occurrence of two or more alleles of a gene |
| 3. | Crossing over during reduction division |
| 4. | Their presence on the same locus of the sister chromatids |
Subtopic: Understanding Linkage | Linkage Types |
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If we want to choose a species for experimental verification of chromosomal theory of inheritance, then to which of the following features would we focus that must be present in the species?
The correct ones are
1. (b), (d) and (e)
2. (b), (c) and (d)
3. (a), (c) and (d)
4. (a), (b), (c) and (d)
| a. | It can be grown in laboratory. |
| b. | It should have large number of chromosomes. |
| c. | It should produce large number of progenies in a single mating |
| d. | Male and female individuals can be easily distinguishable |
| e | It should also be reproduce through asexual means. |
The correct ones are
1. (b), (d) and (e)
2. (b), (c) and (d)
3. (a), (c) and (d)
4. (a), (b), (c) and (d)
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
71%
From NCERT
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On the basis of the results obtained in the experiments conducted by Morgan on Drosophila, all of the following conclusions are said to be correct, except
| 1. | Genes for eye colour and body colour are present on the same chromosome but gene for wing size on different chromosome |
| 2. | Genes for eye colour and body colour, both are present on the same chromosome |
| 3. | There is no gene that controls the wing size is present on Y chromosome |
| 4. | 50% sperms in Drosophila do not have the genes for eye colour, body colour and wing size |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
51%
From NCERT
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Assuming that three genes A, B and C control the skin colour in human being, which of the following couples may have the children with darkest skin colour?
1. AabbCC × aaBbCc
2. AAbbCC × aaBBcc
3. AaBbcc × AabbCc
4. aaBbCc × AaBbCc
1. AabbCC × aaBbCc
2. AAbbCC × aaBBcc
3. AaBbcc × AabbCc
4. aaBbCc × AaBbCc
Subtopic: Polygenic Inheritance & Pleiotropy |
From NCERT
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