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Q. No.Down's syndrome in humans is due to:
1. Three 'X' chromosomes
2. Three copies of chromosome 21
3. Monosomy
4. Two 'Y' chromosomes
Subtopic: Non - Disjunction & Aneuploidy |
89%
From NCERT
NEET - 2013
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Consider the two statements:
Statement I: When Mendel self-pollinated the F1 plants of a monohybrid cross he found that in the F2 generation some of the offspring expressed the character that was not seen in the F1 generation.
Statement II: Mendel found that in a monohybrid cross the F1 always resembled either one of the parents.
1. Statement I is correct, Statement II is correct and Statement II explains Statement I
2. Statement I is correct, Statement II is correct but Statement II does not explain Statement I
3. Statement I is correct, Statement II is incorrect
4. Statement I is incorrect, Statement II is correct
Statement I: When Mendel self-pollinated the F1 plants of a monohybrid cross he found that in the F2 generation some of the offspring expressed the character that was not seen in the F1 generation.
Statement II: Mendel found that in a monohybrid cross the F1 always resembled either one of the parents.
1. Statement I is correct, Statement II is correct and Statement II explains Statement I
2. Statement I is correct, Statement II is correct but Statement II does not explain Statement I
3. Statement I is correct, Statement II is incorrect
4. Statement I is incorrect, Statement II is correct
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
63%
From NCERT
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The law of segregation can be explained by:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I. | the fact that the alleles do not show any blending and that both the characters are recovered as such in the F2 generation though one of these is not seen at the F1 stage. |
| II. | the fact that though the parents contain two alleles during gamete formation, the factors or alleles of a pair segregate from each other such that a gamete receives only one of the two factors. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding | Law of Segregation |
80%
From NCERT
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X-linked recessive traits like red-green colour blindness in humans are observed:
| 1. | more commonly in males than females |
| 2. | more commonly in females than males |
| 3. | in males and females equally |
| 4. | only in the males and never in the females |
Subtopic: Mendelian Disorders |
89%
From NCERT
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Assertion(A): The plants with two different alleles for one character are called heterozygous.
Reason(R): These alleles express contrasting traits.
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. (A) is false, but (R) is true.
Reason(R): These alleles express contrasting traits.
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. (A) is false, but (R) is true.
Subtopic: Monohybrid Cross: 1 |
61%
From NCERT
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Assertion(A): Multiple alleles can be found in an individual.
Reason(R): ABO blood grouping involves three alleles.
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. (A) is false, but (R) is true.
Reason(R): ABO blood grouping involves three alleles.
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. (A) is false, but (R) is true.
Subtopic: Dihybrid Cross: General Consideration |
55%
From NCERT
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Assertion(A): Genes are considered units of inheritance.
Reason(R): These pass down from parents to offspring without any change via gametes as per Mendel.
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. (A) is false, but (R) is true.
Reason(R): These pass down from parents to offspring without any change via gametes as per Mendel.
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. (A) is false, but (R) is true.
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
75%
From NCERT
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Assertion(A): By looking at a tall pea plant, one can tell about its genotype.
Reason(R): Tall pea plants can either be homozygous dominant or heterozygous dominant.
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. (A) is false, but (R) is true.
Reason(R): Tall pea plants can either be homozygous dominant or heterozygous dominant.
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. (A) is false, but (R) is true.
Subtopic: Monohybrid Cross: 1 |
78%
From NCERT
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Assertion(A): Human ABO blood grouping has six different genotypes.
Reason(R): ABO blood grouping involves four different alleles.
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. (A) is false, but (R) is true.
Reason(R): ABO blood grouping involves four different alleles.
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. (A) is false, but (R) is true.
Subtopic: Co-dominance |
80%
From NCERT
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Assertion(A): The starch synthesis gene in its homozygous dominant state produces large starch grains.
Reason(R): The Dominant allele B makes a product for better efficiency in starch synthesis.
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. (A) is false, but (R) is true.
Reason(R): The Dominant allele B makes a product for better efficiency in starch synthesis.
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. (A) is false, but (R) is true.
Subtopic: Co-dominance |
74%
From NCERT
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