Q. No.How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
1.
Five
2.
Six
3.
Eight
4.
Seven
| 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
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?
2. A, B and AB
3. A, B, AB and O
4. Only O
A human female with Turner's syndrome:
1. has 45 chromosomes with XO
2. has one additional chromosome.
3. exhibit male character
4. is able to produce children with a normal husband.
Which of the following statements is not true of two genes that show 50% recombination frequency?
| 1. | The genes are tightly linked. |
| 2. | The genes show independent assortment. |
| 3. | If the genes are present on the same chromosome, they undergo more than one crossing-over in every meiosis. |
| 4. | The genes may be on different chromosomes. |
The incorrect statement with regard to Haemophilia is:
| 1. | It is a recessive disease |
| 2. | It is a dominant disease |
| 3. | A single protein involved in the clotting of blood is affected |
| 4. | it is a sex-linked disease. |
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1: 2: 1. It represents a case of:
1. Co-dominance
2. Dihybrid crosses
3. Monohybrid crosses with complete dominance
4. Monohybrid crosses with incomplete dominance
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
| 1. | The discrete unit controlling a particular character is called a factor. |
| 2. | Out of one pair of factors, one is dominant, and the other recessive. |
| 3. | Alleles do not show any blending and both the characters recover as such in the F2 generation. |
| 4. | Factors occur in pairs. |
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