The karyotype of a person suffering from Down’s syndrome will show:
1.
44 Autosomes + XXY
2.
44 Autosomes + XO
3.
45 Autosomes [trisomy #21] + XY
4.
43 Autosomes [monosomy #21] + XY
Subtopic: Non - Disjunction & Aneuploidy |
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Identify the incorrect statement regarding thalassemia:
| 1. | There is reduced synthesis of one of the globin chains. |
| 2. | It is an autosome-linked dominant blood disease. |
| 3. | Alpha thalassemia is controlled by two closely linked genes on chromosome 16. |
| 4. | Beta thalassemia is controlled by a single gene on chromosome 11. |
Subtopic: Additional Note on Thalassemia |
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Antirrhinum majus with pink flowers was cross pollinated by Antirrhinum majus with white flowers. What proportion of progeny plants are expected to have white flowers?
1. 0
2. ¼
3. ½
4. ¾
1. 0
2. ¼
3. ½
4. ¾
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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When two genes in a dihybrid cross are situated on the same chromosome close to each other, the proportion of parental gene combinations is:
| 1. | much higher than the non-parental type |
| 2. | much lower than the non-parental type |
| 3. | equal to the non-parental type |
| 4. | not seen at all |
Subtopic: Linkage Types | Recombination & Gene Mapping |
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Which of the following is not true regarding phenylketonuria?
| 1. | It is inherited as an autosomal recessive condition. |
| 2. | The affected individual lacks the enzyme phenylalanine hydroxylase. |
| 3. | The affected individuals lack the capability of converting tyrosine to phenylalanine. |
| 4. | Clinical features include mental retardation and a reduction in hair and skin pigmentation. |
Subtopic: Mendelian Disorders |
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Level 1: 80%+
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Identify the incorrectly matched pair:
| 1. | Pleiotropy | Sickle cells anaemia |
| 2. | Polygenic inheritance | Human skin colour |
| 3. | Multiple allelism | ABO blood group |
| 4. | Gene/point mutation | Down’s syndrome |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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XO type of sex determination can be found in:
1. Monkeys
2. Drosophila
3. Birds
4. Grasshoppers
1. Monkeys
2. Drosophila
3. Birds
4. Grasshoppers
Subtopic: Sex Determination |
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Level 1: 80%+
NEET - 2022
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Given below are two statements:
| Statement I: | Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance |
| Statement II: | Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height |
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic: Introduction to Genetics: 2 |
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Level 1: 80%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome. |
| Reason (R): | Closely located genes assort independently. |
In the light of the above statements, choose the correct answer from the options given below:
| 1. | (A) is False, (R) is True. |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 4. | (A) is True, (R) is False. |
Subtopic: Dihybrid Cross Analysis | Linkage Types | Recombination & Gene Mapping |
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NEET - 2022
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The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?
1. a, c, b, d
2. a, d, b, c
3. d, b, a, c
4. a, b, c, d
Subtopic: Recombination & Gene Mapping |
73%
Level 2: 60%+
NEET - 2022
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