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Q. No.Antirrhinum majus with pink flowers is crossed with Antirrhinum majus with white flowers. What is the expected phenotypic ratio in the progeny?
1. 1 [red] : 2 [pink] : 1 white
2. 3 [red] : 1 [white]
3. 1 [pink] : 1 [white]
4. 3 [pink] : 1 [white]
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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Four genes A, B, C and D are linked to the same chromosome in an organism. The distance between the gene pairs is as given below:
What is the order of these four genes?
1. ABCD
2. ACBD
3. ABDC
4. BADC
| [a] | between A and B = 28 map units, |
| [b] | between B and C = 15 map units |
| [c] | between C and D = 25 map units |
| [d] | between B and D = 10 map units |
| [e] | between A and D = 38 map units |
| [f] | between A and C = 13 map units |
1. ABCD
2. ACBD
3. ABDC
4. BADC
Subtopic: Linkage Types | Recombination & Gene Mapping |
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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
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 |
80%
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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 |
75%
From NCERT
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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 |
88%
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 |
90%
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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 |
87%
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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 |
76%
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