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Q. No.Incontinentia pigmenti is a rare X‐linked dominant disorder that affects the skin, hair, teeth, nails and central nervous system. If the offspring of a certain cross has a 50% chance of receiving the disease, regardless of gender, which of the following statements is true?
1. The father has the disease.
2. The mother does not have the disease.
3. The mother is homozygous for the disease.
4. The mother is heterozygous for the disease.
Subtopic: Mendelian Disorders |
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Which of the following is CORRECT statement?
| 1. | Pleiotropic genes exhibit single phenotype. |
| 2. | Pleiotropy is caused by a gene that has multiple phenotypic effects. |
| 3. | Sickle cell anaemia is an example of multifactorial inheritance. |
| 4. | Lethal genes causes the appearance of ancestral characters. |
Subtopic: Polygenic Inheritance & Pleiotropy |
79%
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To analyse the genotype of an organism, it is made to
1. Self cross
2. Cross with recessive parent
3. Cross with dominant parent
4. Cross with another species
1. Self cross
2. Cross with recessive parent
3. Cross with dominant parent
4. Cross with another species
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
79%
From NCERT
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Assertion(A): In Thalassemia an abnormal myoglobin chain is synthesized due to a gene defect
Reason(R): \(\alpha-\)Thalassemia is controlled by genes HBAI and HBA2 on chromosome 16
Reason(R): \(\alpha-\)Thalassemia is controlled by genes HBAI and HBA2 on chromosome 16
| 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: Mendelian Disorders: Thalassemia |
From NCERT
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The number of correct statements from the given statements is:
1. 1
2. 2
3. 3
4. 4
| I: | Gregor Mendel, conducted hybridisation experiments on garden peas for seven years (1856-1863) and proposed the laws of inheritance in living organisms. |
| II: | During Mendel’s investigations into inheritance patterns it was for the first time that statistical analysis and mathematical logic were applied to problems in biology. |
| III: | His experiments had a large sampling size, which gave greater credibility to the data that he collected. |
| IV: | Mendel investigated characters in the garden pea plant that were manifested as two opposing traits. |
2. 2
3. 3
4. 4
Subtopic: Introduction to Genetics: 2 |
84%
From NCERT
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Which of the following traits selected by Mendel for his artificial hybridisation experiments
was a recessive trait in Pisum sativum?
1. Yellow pod colour
2. Yellow seed colour
3. Inflated pod shape
4. Purple flower colour
was a recessive trait in Pisum sativum?
1. Yellow pod colour
2. Yellow seed colour
3. Inflated pod shape
4. Purple flower colour
Subtopic: Monohybrid Cross: Further Understanding |
86%
From NCERT
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Which of the following terms, as related to genetics, refers to having inherited the same versions (alleles)
of a genomic marker from each biological parent?
1. Homologous
2. Heterologous
3. Homozygous
4. Heterozygous
of a genomic marker from each biological parent?
1. Homologous
2. Heterologous
3. Homozygous
4. Heterozygous
Subtopic: Sex Determination |
71%
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Monohybrid cross can explain:
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: | Law of dominance |
| II: | Law of segregation |
| III: | Law of independent assortment |
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: Monohybrid Cross: 1 |
83%
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In Mendelian Inheritance:
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: | Some alleles are dominant while others are recessive; an organism with at least one dominant allele will display the effect of the dominant allele. |
| II: | During gamete formation, the alleles for each gene segregate from each other so that each gamete carries only one allele for each gene. |
| III: | Genes of different traits can segregate independently during the formation of gametes. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Dihybrid Cross Analysis |
86%
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Consider the two statements:
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: | In Incomplete Dominance F1 has a phenotype that does not resemble either of the two parents and is in between the two. |
| II: | In Co-Dominance F1 has a phenotype that resembles both the parents. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Law of Segregation |
91%
From NCERT
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