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Q. No.The two alleles of a gene pair are located on:
1. homologous sites on homologous chromosomes
2. homologous sites on heterologous chromosomes
3. heterologous sites on homologous chromosomes
4. heterologous sites on heterologous chromosomes
Subtopic: Monohybrid Cross: 1 |
80%
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Assuming independent assortment, how many different phenotypes can appear in the offspring if individual plants with genotype AaBb are intercrossed?
1. 2
2. 3
3. 4
4. 9
1. 2
2. 3
3. 4
4. 9
Subtopic: Dihybrid Cross Analysis |
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In Pisum sativum, Mendel studied:
1. 7 characters and 7 contrasting traits
2. 7 characters and 14 contrasting traits
3. 14 characters and 7 contrasting traits
4. 14 characters and 14 contrasting traits
1. 7 characters and 7 contrasting traits
2. 7 characters and 14 contrasting traits
3. 14 characters and 7 contrasting traits
4. 14 characters and 14 contrasting traits
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
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In Mendelian inheritance, a recessive allele for a character is the one that:
| 1. | is least frequent in the population |
| 2. | was the original allele, from which other alleles have been formed by mutation |
| 3. | expresses itself only in homozygous condition |
| 4. | does not segregate during gamete formation |
Subtopic: SUMMARY |
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From NCERT
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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
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 |
77%
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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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