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Q. No.A dihybrid cross yields a phenotypic ratio of 9 : 3 : 3 : 1 in F2 progeny. Most likely, the two genes:
1. are assorting independently
2. are tightly linked on an autosome
3. are linked to a sex chromosome
4. control the same trait
Subtopic: Dihybrid Cross: General Consideration |
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If a woman who is a known carrier for the gene of colour blindness marries a normal male, what percent of her male progeny are expected to be affected by the condition?
1. 0
2. 25
3. 50
4. 100
Subtopic: Mendelian Disorders |
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Consider the two given statements:
1. Statement I is correct; Statement II is incorrect
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
| Statement I: | Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome(s). |
| Statement II: | Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism. |
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
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Identify the incorrect statement:
1. Yellow pod colour is a recessive trait in Pisum sativum.
2. Mendel applied statistical analysis and mathematical logic for the first time to problems in biology.
3. If a test cross results in progeny with two different phenotypes, the parent plant with dominant phenotype must be homozygous for the trait.
4. Although a gene can have more than two alleles, an individual can have only two alleles in somatic cells.
1. Yellow pod colour is a recessive trait in Pisum sativum.
2. Mendel applied statistical analysis and mathematical logic for the first time to problems in biology.
3. If a test cross results in progeny with two different phenotypes, the parent plant with dominant phenotype must be homozygous for the trait.
4. Although a gene can have more than two alleles, an individual can have only two alleles in somatic cells.
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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Which of the following comparisons between different degrees of dominance between alleles of same gene are correct?
1. I, II, III and IV only
2. I and IV only
3. II and III only
4. I, II, III, Iv and V
| Complete dominance | Incomplete dominance | Co-dominance | ||
| I | F1 progeny | Resemble one of the parents | Do not resemble either of the parents | Resemble both parents |
| II | F2 phenotypic ratio | 3 : 1 | 1: 2 : 1 | 1: 2 : 1 |
| III | F2 genotypic ratio | 1: 2 : 1 | 1: 2 : 1 | 1: 2 : 1 |
| IV | Example | Height in garden pea | Flower colour in snapdragon | ABO blood group |
| V | Blending | Does not occur | Occurs | Occurs |
1. I, II, III and IV only
2. I and IV only
3. II and III only
4. I, II, III, Iv and V
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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In a typical dihybrid cross AaBb X AaBb [assuming independent assortment], what would be the ratio of the progeny with the genotypes – AaBb, Aabb, aaBb and aabb respectively?
1. 1: 1: 1: 1
2. 4: 2: 2: 1
3. 3: 1: 1: 3
4. 9: 3: 3: 1
1. 1: 1: 1: 1
2. 4: 2: 2: 1
3. 3: 1: 1: 3
4. 9: 3: 3: 1
Subtopic: Dihybrid Cross Analysis |
61%
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Consider the given two statements:
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is correct
| Statement I | If two genes are located on heterologous chromosomes they will assort independently and a dihybrid cross will yield a F2 phenotypic ratio of 9: 3: 3: 1. |
| Statement II | If the two genes are linked the dihybrid F2 phenotypic ratio will vary significantly from 9: 3: 3: 1 with strength of linkage directly proportional to the distance between the genes. |
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is correct
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations | Recombination & Gene Mapping |
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In polygenic inheritance:
1. traits have distinct alternate forms.
2. the expression of the genes is immune to the effects of the environment.
3. the phenotype reflects the contribution of each allele.
4. a single gene can exhibit multiple phenotypic expression.
1. traits have distinct alternate forms.
2. the expression of the genes is immune to the effects of the environment.
3. the phenotype reflects the contribution of each allele.
4. a single gene can exhibit multiple phenotypic expression.
Subtopic: Polygenic Inheritance & Pleiotropy |
61%
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Identify the incorrect statement regarding mechanism of sex determination in varied organisms:
1. Male honeybees do not have a father and cannot have sons, but have a grandfather and can have grandsons.
2. Male grasshoppers have odd number of chromosomes in their somatic cells while the female grasshoppers have even number.
3. The females are heterogametic in birds.
4. If a couple has a daughter, they will have a son in next pregnancy as there is 50 percent probability of either a male or a female child in each pregnancy.
1. Male honeybees do not have a father and cannot have sons, but have a grandfather and can have grandsons.
2. Male grasshoppers have odd number of chromosomes in their somatic cells while the female grasshoppers have even number.
3. The females are heterogametic in birds.
4. If a couple has a daughter, they will have a son in next pregnancy as there is 50 percent probability of either a male or a female child in each pregnancy.
Subtopic: Sex Determination |
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Which of the following pedigrees can be due to oculocutaneous albinism, an autosomal recessive condition?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Pedigree Analysis: More Examples |
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