Q. No.In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
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
| 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 |
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
A gene showing co-dominance has?
| 1. | One allele is dominant on the other |
| 2. | Alleles are tightly linked on the same chromosome |
| 3. | Alleles that are recessive to each other |
| 4. | Both alleles are independently expressed in the heterozygote |
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
A pleiotropic gene:
| 1. | Is expressed only in primitive plants |
| 2. | Is a gene that evolved during Pliocene |
| 3. | Controls a trait only in combination with another gene |
| 4. | Controls multiple traits in an individual |
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
| 1. | Five | 2. | Six |
| 3. | Eight | 4. | Seven |
Alleles are:
1. different phenotype
2. true breeding homozygotes
3. different molecular forms of a gene
4. heterozygotes
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