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
| 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. |
| 1. | Pleiotropy | Sickle cells anaemia |
| 2. | Polygenic inheritance | Human skin colour |
| 3. | Multiple allelism | ABO blood group |
| 4. | Gene/point mutation | Down’s syndrome |
1. Monkeys
2. Drosophila
3. Birds
4. Grasshoppers
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.
Which of the following occurs due to the presence of autosome linked dominant trait?
1. Thalessemia
2. Sickle cell anaemia
3. Myotonic dystrophy
4. Haemophilia
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 339461
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 339461
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 false and (R) does not correctly explain (A). |
| 4. | (A) is true, (R) is false. |
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
1. 100%
2. 25%
3. 50%
4. 75%
Select the correct statements with respect to pleiotropism:
| (a) | A gene is said to be pleiotropy if it affects more than one trait |
| (b) | Phenylketonuria is an example of pleiotropy |
| (c) | A condition where one gene has several alleles is referred to as pleiotropism |
| (d) | A trait is said to be pleiotropic if several genes control it |
Choose the correct answer from the options given below:
1. (a) and (b) only
2. (a) and (d) only
3. (a), (b) and (c) only
4. (b), (c) and (d) only
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