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Q. No.A group of geneticists are trying to figure out the dominance hierarchy for a newly discovered plant. They have found that when a truebreeding red plant is crossed with a truebreeding blue plant, the resulting offspring are purple. What is the most likely explanation for this result?
1. Red is the dominant allele
2. Blue is the dominant allele
3. Incomplete dominance
4. Codominance
Subtopic: Monohybrid Cross: 1 |
80%
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Which of the following crosses can never result in a recessive phenotype?
1. Tt Pp X Tt Pp
2. tt pp X TT PP
3. tt pp X Tt Pp
4. TT Pp X tt pp
1. Tt Pp X Tt Pp
2. tt pp X TT PP
3. tt pp X Tt Pp
4. TT Pp X tt pp
Subtopic: Dihybrid Cross Analysis |
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When a black rabbit and a lilac rabbit are crossed, all of the offspring have black and lilac spots. What type of genetic inheritance is represented here?
1. Incomplete dominance
2. Codominance
3. Polygenic inheritance
4. Pleiotropy
Subtopic: Monohybrid Cross: 1 |
71%
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Which one of the following is pure breeding for only one character?
1. HhRr
2. HHRr
3. HHRR
4. hhrr
1. HhRr
2. HHRr
3. HHRR
4. hhrr
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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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.
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 |
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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 |
80%
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 |
85%
From NCERT
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