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Q. No.In Pisum sativum, the allele for tallness [T] is completely dominant over the allele for dwarfness [t]. What proportion of the tall progeny of the cross Tt X Tt will be homozygous tall?
1. 1/3
2. 1/4
3. 1/2
4. 3/2
Subtopic: Monohybrid Cross: 1 |
From NCERT
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A pea plant shows the dominant phenotype. You conduct a single gene test cross to determine the genotype of this pea plant (T = tall, t = short). All progeny of the test cross show the dominant phenotype. The genotype of the plant in question is most likely:
1. TT.
2. TTtt.
3. Tt.
4. tt.
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
75%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Number of possible phenotypes in ABO blood group system | P | 1 : 2 : 1 |
| B | Number of possible genotypes in ABO blood group system | Q | 3 : 1 |
| C | F2 phenotypic ratio in incomplete dominance | R | 4 |
| D | F2 phenotypic ratio in complete dominance | S | 6 |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Monohybrid Cross: 1 | Dominance Deviation from Mendel: 1 | Dominance Deviation from Mendel: 2 |
90%
From NCERT
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If two genes are closely linked on the same chromosome:
| 1. | they will assort independently |
| 2. | the proportion of recombinants formed will be higher than the parental types |
| 3. | the proportion of recombinants formed will be much lower than the parental types |
| 4. | the proportion of recombinants formed will be equal to that of the parental types |
Subtopic: Linkage Types | Recombination & Gene Mapping |
85%
From NCERT
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The trait, shown by solid symbols in the given pedigree, is MOST LIKELY inherited as:
1. Autosomal recessive trait
2. Sex linked recessive trait
3. Autosomal dominant trait
4. Sex linked dominant trait
1. Autosomal recessive trait
2. Sex linked recessive trait
3. Autosomal dominant trait
4. Sex linked dominant trait
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
52%
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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]
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 |
58%
From NCERT
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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 |
89%
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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%
From NCERT
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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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