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Q. No.A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed, the resulting genotypes were in the ratio of:
1. 1:2:1 :: Tall heterozygous : Tall homozygous : Drawf
2. 3:1 :: Tall : Dwarf
3. 3:1:: Dwarf : Tall
4. 1:2:1:: Tall homozygous : Tall heterozygous : Dwarf
2. 3:1 :: Tall : Dwarf
3. 3:1:: Dwarf : Tall
4. 1:2:1:: Tall homozygous : Tall heterozygous : Dwarf
Subtopic: Monohybrid Cross: 1 |
76%
From NCERT
NEET - 2016
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Pick out the correct statements:
| I: | Haemophilia is a sex-linked recessive disease. |
| II: | Down’s syndrome is due to aneuploidy. |
| III: | Phenylketonuria is an autosomal recessive gene disorder. |
| IV: | Sickle cell anaemia is an X-linked recessive gene disorder |
1. II and IV are correct
2. I, III and IV are correct
3. I, II and III are correct
4. I and IV are correct
2. I, III and IV are correct
3. I, II and III are correct
4. I and IV are correct
Subtopic: Mendelian Disorders: Sickle Cell Anemia | Mendelian Disorders | Mendelian Disorders: Hemophilia | Non - Disjunction & Aneuploidy |
80%
From NCERT
NEET - 2016
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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
| 1. | chromosomes failed to separate during meiosis |
| 2. | the two genes are linked and present on the same chromosome |
| 3. | both of the characters are controlled by more than one gene |
| 4. | the two genes are located on two different chromosomes |
Subtopic: Linkage | Recombination Gene Mapping |
82%
From NCERT
NEET - 2016
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Match the terms in Column I with their description in Column II and choose the correct option.
| Column I | Column II | ||
| A. | Dominance | 1. | Many govern a single character |
| B. | Codominance | 2. | In a heterozygous organism, only one allele expresses itself |
| C. | Pleiotropy | 3. | In a heterozygous organism, both alleles express themselves fully |
| D. | Polygenic inheritance | 4. | A single gene influences many characters |
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 4 | 3 | 1 | 2 |
| 4. | 2 | 1 | 4 | 3 |
Subtopic: Polygenic Inheritance & Pleiotropy | Co-dominance |
91%
From NCERT
NEET - 2016
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Which of the following most appropriately describes haemophilia?
1. X-linked recessive gene disorder
2. Chromosomal disorder
3. Dominant gene disorder
4. Recessive gene disorder
Subtopic: Mendelian Disorders: Hemophilia |
91%
From NCERT
NEET - 2016
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A gene showing co-dominance has?
| 1. | One allele is dominant on the other |
| 2. | Alleles are tightly linked on the same chromosome |
| 3. | Alleles that are recessive to each other |
| 4. | Both alleles are independently expressed in the heterozygote |
Subtopic: Dominance Deviation from Mendel: 1 |
84%
From NCERT
NEET - 2015
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Subtopic: Linkage |
92%
From NCERT
NEET - 2015
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In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree:
1. Autosomal dominant
2. X-linked recessive
3. Autosomal recessive
4. X-linked dominant
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
53%
From NCERT
NEET - 2015
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In his classic experiments on pea plants Mendel did not use?
1. Seed color
2. Pod length
3. Seed shape
4. Flower position
Subtopic: Introduction to Genetics: 2 |
91%
From NCERT
NEET - 2015
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A pleiotropic gene:
| 1. | Is expressed only in primitive plants |
| 2. | Is a gene that evolved during Pliocene |
| 3. | Controls a trait only in combination with another gene |
| 4. | Controls multiple traits in an individual |
Subtopic: Polygenic Inheritance & Pleiotropy |
90%
From NCERT
NEET - 2015
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