Consider the given two statements:
Assertion:
Multiple alleles can be found only when population studies are made.
Reason:
Multiple alleles for the same gene are always located on heterologous chromosomes.
1. Both Assertion and Reason are true and Reason correctly explains Assertion
2. Both Assertion and Reason are true but Reason does not correctly explain Assertion
3. Assertion is true but Reason is false
4. Assertion is false but Reason is true
Subtopic: Genic Balance Theory |
76%
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In pea seeds, starch synthesis in pea seeds is controlled by one gene. A plant with genotype Bb will produce:
I: large starch grains
II: smaller starch grains
III: intermediate sized starch grains
IV: round seeds
V: wrinkled seeds
1. Only I and IV
2. Only II and V
3. Only III and IV
4. Only III and V
I: large starch grains
II: smaller starch grains
III: intermediate sized starch grains
IV: round seeds
V: wrinkled seeds
1. Only I and IV
2. Only II and V
3. Only III and IV
4. Only III and V
Subtopic: Monohybrid Cross: 1 |
81%
From NCERT
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Using the genotypic symbols Y for dominant yellow seed colour and y for recessive green seed colour, R for round shaped seeds and r for wrinkled seed shape, when a plant with genotype RrYy is self hybridised, the proportion of progeny with yellow seeds is expected to be:
1. 9/16
2. 3/16
3. 3/4
4. 1/4
1. 9/16
2. 3/16
3. 3/4
4. 1/4
Subtopic: Dihybrid Cross Analysis |
66%
From NCERT
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This type of inheritance patter for the trait shown in the given pedigree most likely is:
1. Autosomal Dominant
2. Autosomal Recessive
3. X-linked Dominant
4. X linked recessive
1. Autosomal Dominant
2. Autosomal Recessive
3. X-linked Dominant
4. X linked recessive
Subtopic: Pedigree Analysis: Basics |
84%
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Three Scientists independently rediscovered Mendel’s results on the inheritance of characters in 1900. They were:
1. Avery–MacLeod–McCarty
2. de Vries, Correns and von Tschermak
3. Nirenberg, Mathei, Khorana
4. Paul Berg, Boyer and Cohen
1. Avery–MacLeod–McCarty
2. de Vries, Correns and von Tschermak
3. Nirenberg, Mathei, Khorana
4. Paul Berg, Boyer and Cohen
Subtopic: Chromosomal Basis of Inheritance: Introduction |
92%
From NCERT
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That the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried is the argument that formed the basis for:
1. the Law of Independent Assortment.
2. the Concept of Linkage
3. the chromosomal theory of inheritance.
4. the One Gene One Enzyme hypothesis.
1. the Law of Independent Assortment.
2. the Concept of Linkage
3. the chromosomal theory of inheritance.
4. the One Gene One Enzyme hypothesis.
Subtopic: Chromosomal Basis of Inheritance: Introduction |
52%
From NCERT
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Consider the two statements:
| Statement I: | The fruit fly is a popular choice as a model organism in genetics. |
| Statement II: | It has a very long generation time and low fecundity (females lay only a few eggs in life time). |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Chromosomal Basis of Inheritance: Further Considerations |
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When the two genes in a dihybrid cross were situated on the same chromosome:
| 1. | the proportion of parental gene combinations were much lower than the non-parental type. |
| 2. | the proportion of parental gene combinations were much higher than the non-parental type. |
| 3. | the proportion of parental gene combinations were equal to the non-parental type. |
| 4. | only the parental gene combinations were seen in the progeny. |
Subtopic: Linkage |
88%
From NCERT
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Regarding the law of independent assortment:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Because of independent assortment and dominance, the 9:3:3:1 dihybrid phenotypic ratio can be collapsed into two 3:1 ratios, characteristic of any monohybrid cross that follows a dominant and recessive pattern. |
| Statement II: | The law of independent assortment also indicates that a cross between yellow, wrinkled (YYrr) and green, round (yyRR) parents would yield the same F1 and F2 offspring as in the YYRR x yyrr cross. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Dihybrid Cross Analysis |
72%
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The number of offspring genotypes and phenotypes are expected in a trihybrid cross between parents heterozygous for all three traits, assuming independent assortment and complete dominance?
1. 64 genotypes; 16 phenotypes
2. 16 genotypes; 64 phenotypes
3. 8 genotypes; 27 phenotypes
4. 27 genotypes; 8 phenotypes
1. 64 genotypes; 16 phenotypes
2. 16 genotypes; 64 phenotypes
3. 8 genotypes; 27 phenotypes
4. 27 genotypes; 8 phenotypes
Subtopic: Conclusion |
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