Given below are two statements:
Assertion (A):
A recessive character that is not expressed in heterozygous condition can express when it becomes homozygous.
Reason (R):
Characters segregate during the formation of gametes.
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Â Monohybrid Cross: 1 |Â Law of Segregation |
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From NCERT
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Given below are two statements:
| Assertion (A): | Externally it is not possible to distinguish between the pea plants with the genotypes TT or Tt regarding their heights. |
| Reason (R): | Due to the dominance of one trait over the other, 3/4th of the F2 plants in Mendelian monohybrid cross were tall. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Monohybrid Cross: 1 |
 61%
From NCERT
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Given below are two statements:
| Assertion (A): | In each pregnancy there is always 50 percent probability of either a male or a female child. |
| Reason (R): | Genetic makeup of the sperm determines the sex of a child. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Sex Determination |
From NCERT
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Given below are two statements:
| Assertion (A): | In Mendel's dihybrid cross, the F1 hybrid produces gametes of four different genotypes, each with a frequency of 25% of the total gametes produced. |
| Reason (R): | Genes for the characters considered in Mendelian dihybrid cross are not linked and thus there segregation is independent of each other. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Dihybrid Cross: General Consideration |
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From NCERT
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Given below are two statements:
| Assertion (A): | Regarding sickle-cell anaemia, heterozygous (HbAHbS) individuals appear unaffected but are carrier of the disorder. |
| Reason (R): | (HbAHbS) individual has sickle cell trait as there is 50% probability of transmission of the mutant gene to the progeny. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Mendelian Disorders: Sickle Cell Anemia |
 69%
From NCERT
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Statistical analysis and mathematical logic were applied to the problems in biology by
(a) Thomas Hunt Morgan
(b) Gregor Mendel
(c) Alfred Sturtevant
The correct one(c) is/are
1. (b) and (c) only
2. All (a), (b) and (c)
3. (b) only
4. (a) and (b) only
(a) Thomas Hunt Morgan
(b) Gregor Mendel
(c) Alfred Sturtevant
The correct one(c) is/are
1. (b) and (c) only
2. All (a), (b) and (c)
3. (b) only
4. (a) and (b) only
Subtopic: Â Introduction to Genetics: 1 |Â Introduction to Genetics: 2 |
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In Mendel's dihybrid cross, by taking the characters seed shape and seed colour in pea plant, the phenotypic ratio in F2 generation 9 : 3 : 3 : 1 is obtained. This is because
| 1. | Genes for both the characters are located on the same chromosomes and follow the law of dominance |
| 2. | Alleles of seed shape and seed colour are present on the same locus of a pair of homologous chromosomes |
| 3. | Genes for both the characters are present on different chromosomes and follow law of dominance |
| 4. | Genes for seed shape and seed colour are present on the different loci of the same chromosome and follow the law of codominance |
Subtopic: Â Dihybrid Cross: General Consideration |
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From NCERT
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Which of the given is not related to aneuploidy?
| 1. | Arise due to failure of segregation of chromatids during cell cycle |
| 2. | There is increase in whole set of chromosomes |
| 3. | Exemplified by Down's syndrome |
| 4. | Involves gain or loss of one or a few chromosomes |
Subtopic: Â Non - Disjunction & Aneuploidy |
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From NCERT
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The traits related to pea plants considered by Mendel in his experiments, how many were related to pod?
1. Four
2. Six
3. Eight
4. Two
1. Four
2. Six
3. Eight
4. Two
Subtopic: Â Introduction to Genetics: 1 |Â Introduction to Genetics: 2 |
From NCERT
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A pleiotropic gene
1. Express many traits that spread across a gradient
2. Has more than two alleles
3. Controls different characters
4. Always follows Mendel's law of dominance
1. Express many traits that spread across a gradient
2. Has more than two alleles
3. Controls different characters
4. Always follows Mendel's law of dominance
Subtopic: Â Polygenic Inheritance & Pleiotropy |
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From NCERT
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