According to Mendelism which character is showing dominance:
1. Terminal position of the flower
2. Green colour in the seed coat
3. Wrinkled seed
4. Green pod colour
Which of the following is the correct match:
1. Down Syndrome = 21st Chromosome
2. Sickel cell anaemia = X – Chromosome
3. Haemophilia = Y – Chromosome
4. Parkinson Disease = X & Y Chromosomes
Change in the sequence of nucleotides in DNA is called:
1. Mutagen
2. Mutation
3. Recombination
4. Translation
Which of the following is the example of a sex-linked disease:
1. AIDS
2. Colour blindness
3. Syphilis
4. Gonorrhoea
A gene is said to be dominant if:
1. | It expresses its effect only in the homozygous stage |
2. | It expresses only in heterozygous condition |
3. | It expresses both in homozygous and heterozygous conditions |
4. | It is never expressed in any condition |
Mangolian idiots are due to trisomy in the 21st chromosome is called:
1. Down's syndrome
2. Turner's syndrome
3. Kleinfelters syndrome
4. Triplex syndrome
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in males. It proves:
1. | In human beings, the Y chromosome is active in sex determination. |
2. | Y chromosome is active in sex determination in both human beings and Drosophila. |
3. | In Drosophila Y-chromosome decides femaleness. |
4. | The Y chromosome of man has genes for the syndrome. |
The linkage map of the X-chromosome of fruitfly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be:
1. 60%
2. > 50%
3. ≤ 50%
4. 100%
Which one of the following traits of garden peas studied by Mendel was a recessive feature?
1. | Axial flower position |
2. | Green seed colour |
3. | Green pod colour |
4. | Round seed shape |
When a cluster of genes shows linkage behaviour they:
1. Do not show a chromosome map
2. Show recombination during meiosis
3. Do not show independent assortment
4. Induce cell division