Q. No.Genotype of hybrid is known by crossing
1. F2 progeny with female parent
2. F1 × F1
3. Crossing F1 with recessive parent
4. F2 with recessive parent.
1. F2 progeny with female parent
2. F1 × F1
3. Crossing F1 with recessive parent
4. F2 with recessive parent.
In pea, yellow seed colour is dominant over green colour. Heterozygous yellow seeded plant is crossed with green seeded plant. The ratio of yellow & green seeded offspring will be
1. 9 : 1
2. 1 : 3
3. 3 : 1
4.50 : 50
A human male produces diallelic sperms in equal proportion AB, Ab, aB, and ab. The genotype of the person would be:
| 1. | Aa Bb | 2. | Aa BB |
| 3. | AA Bb | 4. | AA BB. |
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Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage ?
1. Erythroblastosisfetalis – X- linked
2. Down’s syndrome – 44 autosomes + XO
3. Klinefelter’ssyndrome – 44 autosomes + XXY
4. Colour blindness – Y-linked
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having:
| 1. | No anitgens A and B on RBCs |
| 2. | Other antigens besides A and B on RBCs |
| 3. | Overdominance of this type on the genes for A and B types |
| 4. | One antibody only - either anti-A or anti-B on the RBCs |
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Study the pedigree chart given below:
What does it show:
| 1. | Inheritance of a recessive sex-linked disease like haemophilia |
| 2. | Inheritance of a sex-linked inborn error of metabolism like phenylketonuria |
| 3. | Inheritance of condition like phenylketonuria as an autosomal recessive trait |
| 4. | The pedigree chart is wrong as this is not possible |
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Which one of the following symbols and its representation, used in human pedigree analysis is correct?
Which one of the following cannot be explained on the basis of Mendel’s Law of Dominance
1. Out of one pair of factors one is dominant and the other recessive
2. Alleles do not show any blending and both the characters recover as such in F2 generation
3. Factors occur in pairs
4. The discrete unit controlling a particular character is called a factor
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ABO blood groups in humans are controlled by the gene I. It has three alleles -IA,IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
1. One
2. Four
3. Two
4. Three
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