Q. No.Which one from those given below is the period for Mendel's hybridization experiments?
1.
1840-1850
2.
1857-1869
3.
1870-1877
4.
1856-1863
2. 3:1 :: Tall : Dwarf
3. 3:1:: Dwarf : Tall
4. 1:2:1:: Tall homozygous : Tall heterozygous : Dwarf
| I: | Haemophilia is a sex-linked recessive disease. |
| II: | Down’s syndrome is due to aneuploidy. |
| III: | Phenylketonuria is an autosomal recessive gene disorder. |
| IV: | Sickle cell anaemia is an X-linked recessive gene disorder |
2. I, III and IV are correct
3. I, II and III are correct
4. I and IV are correct
| 1. | chromosomes failed to separate during meiosis |
| 2. | the two genes are linked and present on the same chromosome |
| 3. | both of the characters are controlled by more than one gene |
| 4. | the two genes are located on two different chromosomes |
Match the terms in Column I with their description in Column II and choose the correct option.
| Column I | Column II | ||
| A. | Dominance | 1. | Many govern a single character |
| B. | Codominance | 2. | In a heterozygous organism, only one allele expresses itself |
| C. | Pleiotropy | 3. | In a heterozygous organism, both alleles express themselves fully |
| D. | Polygenic inheritance | 4. | A single gene influences many characters |
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 4 | 3 | 1 | 2 |
| 4. | 2 | 1 | 4 | 3 |
A cell at the telophase stage is observed by a student in a brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:
1. polyploidy
2. somaclonal variation
3. polyteny
4. aneuploidy
Which of the following most appropriately describes haemophilia?
1. X-linked recessive gene disorder
2. Chromosomal disorder
3. Dominant gene disorder
4. Recessive gene disorder
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree:
1. Autosomal dominant
2. X-linked recessive
3. Autosomal recessive
4. X-linked dominant
In his classic experiments on pea plants Mendel did not use?
1. Seed color
2. Pod length
3. Seed shape
4. Flower position
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