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
Subtopic: Â Conclusion |
 53%
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Consider the given two statements:
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: | Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment. |
| Statement II: | In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
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: Â Polygenic Inheritance & Pleiotropy |
 92%
From NCERT
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When a single gene can exhibit multiple phenotypic expression, the gene is said to be:
1. showing phenotypic plasticity
2. polygenic
3. pleiotropic
4. polymorphic
1. showing phenotypic plasticity
2. polygenic
3. pleiotropic
4. polymorphic
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 92%
From NCERT
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Males have one X and one Y chromosome in:
I: Humans
II: Grasshoppers
III: Birds
IV: Fruit fly
1. Only I and II
2. Only I and IV
3. Only II and III
4. Only II and IV
I: Humans
II: Grasshoppers
III: Birds
IV: Fruit fly
1. Only I and II
2. Only I and IV
3. Only II and III
4. Only II and IV
Subtopic: Â Pedigree Analysis: Basics |
 85%
From NCERT
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Consider the given two statements:
| Assertion (A): | Male honeybees do not have father and thus cannot have sons, but have a grandfather and can have grandsons. |
| Reason (R): | Male honeybees produce sperms by mitosis. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Â Sex Determination: Further Considerations |
 55%
From NCERT
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Consider the given two statements:
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
| Assertion: | A sex linked recessive disorders is expected to be more common in males than in females. |
| Reason: | Males are hemizygous for sex chromosomes. |
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: Â Sex Linked Recessive Inheritance |
 74%
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What is not true regarding Phenylketonuria?
1. It is inborn error of metabolism.
2. It is inherited as the autosomal recessive trait.
3. The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine.
4. Accumulation of phenylpyruvic acid in brain results in mental retardation.
1. It is inborn error of metabolism.
2. It is inherited as the autosomal recessive trait.
3. The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine.
4. Accumulation of phenylpyruvic acid in brain results in mental retardation.
Subtopic: Â Mendelian Disorders |
 84%
From NCERT
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Consider the two statements:
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: | Thalassemia is a qualitative problem of synthesising an incorrectly functioning globin. |
| Statement II: | Sickle cell anaemia is a quantitative problem of synthesising too few globin molecules while the latter. |
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: Â Mendelian Disorders: Thalassemia |
 84%
From NCERT
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Turner’s Syndrome:
I: is an aneuploidy
II: causes infertility in affected females
III: does not affect the development secondary sexual characters in affected females
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
I: is an aneuploidy
II: causes infertility in affected females
III: does not affect the development secondary sexual characters in affected females
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Â Sex Aneuploidy - Turner & Klinefelter Syndrome |
 83%
From NCERT
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The cause of Klinefelter's syndrome in humans is :
1. Absence of Y-chromosome
2. Absence of X-chromosome
3. Extra copy of an autosome
4. Extra copy of an X-chromosome
1. Absence of Y-chromosome
2. Absence of X-chromosome
3. Extra copy of an autosome
4. Extra copy of an X-chromosome
Subtopic: Â Sex Aneuploidy - Turner & Klinefelter Syndrome |
 79%
From NCERT
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