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: Â Mendelian Disorders |
 90%
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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: Â Monohybrid Cross: 1 |
 61%
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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: Â Dihybrid Cross: General Consideration |
 54%
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: Â Monohybrid Cross: 1 |Â 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: Â Monohybrid Cross: 1 |
 77%
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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: Â Co-dominance |
 80%
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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: Â Co-dominance |
 73%
From NCERT
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Assertion(A): Dominance is an autonomous feature of a gene.
Reason(R): Dominance depends not only on gene product but also on the type of phenotype that we choose to examine.
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): Dominance depends not only on gene product but also on the type of phenotype that we choose to examine.
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: Â Co-dominance |
 56%
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Assertion(A): Dihybrid crosses are made based on an assumption that the two genes are following the law of independent assortment.
Reason(R): Four types of phenotypic combinations are possible in the gametes of each parent in such a cross.
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): Four types of phenotypic combinations are possible in the gametes of each parent in such a cross.
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: Â Dihybrid Cross: General Consideration |
From NCERT
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Assertion(A): Deletion, insertion, and duplication of a segment of DNA result in alteration in chromosomes.
Reason(R): Alteration in chromosomes results in abnormalities.
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): Alteration in chromosomes results in abnormalities.
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: Â Mutation |
 67%
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