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Q. No.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 |
55%
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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 |
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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 |
52%
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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Male and female individuals in which of the following organisms do not have the same number of chromosomes?
(a) Human
(b) Grasshopper
(c) Honey bee
(d) Drosophila
1. (a) and (d)
2. (b) and (c)
3. (b) and (d)
4. (c) only
(a) Human
(b) Grasshopper
(c) Honey bee
(d) Drosophila
1. (a) and (d)
2. (b) and (c)
3. (b) and (d)
4. (c) only
Subtopic: Sex Determination |
78%
From NCERT
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Which amongst the following pedigree charts best represents the inheritance of traits such as Myotonic dystrophy?
{Here, shaded symbols represent the affected ones.}
1.
2.
3.
4.
{Here, shaded symbols represent the affected ones.}
1.
2.
3.
4.
Subtopic: Pedigree Analysis: Basics |
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\(\alpha\) Thalassemia is controlled by two closely linked genes HBA1 and HBA2. In a man suffering from this disorder both the genes are mutated, but during the process of spermatogenesis normal condition in one of the genes HBA2 is restored. If the sperm fertilises an egg having mutated HBA1 gene then which of the following statements regarding the resulting child would be true?
| 1. | This child either male or female will not show any symptom of the trait |
| 2. | The child will show the trait only if he is a male |
| 3. | This child will show mild symptom of the trait regardless of the gender |
| 4. | The child will show the trait only if she is a female |
Subtopic: Mendelian Disorders: Thalassemia |
58%
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A son to be colourblind
1. Must have colourblind father
2. Must have normal mother and carrier father
3. Must have unaffected parents
4. Can have a carrier mother and normal father
1. Must have colourblind father
2. Must have normal mother and carrier father
3. Must have unaffected parents
4. Can have a carrier mother and normal father
Subtopic: Mendelian Disorders |
79%
From NCERT
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A heterozygous female for sickle cell anaemia (HbAHbs)
| 1. | Transmits the trait to her sons only |
| 2. | Has 50% probability of transmission of the mutant gene to the progeny |
| 3. | Is considered diseased and dies before maturity |
| 4. | Is normal and does not pass the trait for sickle cell anaemia to her progeny |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
82%
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Recombination frequency
1. Is directly proportional to the distance between the genes
2. Is not useful to prepare the genetic maps
3. Of closely situated genes is very high
4. Is directly proportional to linkage
1. Is directly proportional to the distance between the genes
2. Is not useful to prepare the genetic maps
3. Of closely situated genes is very high
4. Is directly proportional to linkage
Subtopic: Recombination & Gene Mapping |
83%
From NCERT
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