CBSE
What base is responsible for hot spots for spontaneous pint mutations?
Adenine
Guanine
5-bromouracil
5-methyl cytosine
A hereditary disease which is never passed on from father to son is
X-chromosomal linked disease
Autosomal linked disease
Y chromosomal linked disease
None of the above
In Pisum sativum, there are 14 chromosomes. How many types of homologous pairs can be prepared?
14
7
214
210
Match the following Column I with Column II.
Column I | Column II |
A. Complementrary Ratio | 1. 9:7 |
B. Supplementary Ratio | 2. 9:3:4 |
C. Epistatic Ratio | 3. 12:3:1 |
D. Inhibitory Ratio | 4. 13:3 |
A-4, B-1, C-3, D-2
A-1, B-2, C-3, D-4
A-4, B-1, C-2, D-3
A-1, B-3, C-2, D-4
In peal plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants could you expect in F1-generation
9 : 1
1 : 3
3 : 1
50 : 50
Number of Barr body which will found in case of Turner’s syndrome will be
1
2
0
Can't be determined by given data
In a mutational event, when adenine is replaced by guanine, it is a case of
Frameshift mutation
Transcription
Transition
Transversion
A man of blood group- A marries a woman of blood group- AB, which type of progeny would indicate that man is heterozygous?
O
B
A
AB
A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?
All sons and daughters are haemophilic and colourblind
Haemophilic and colourblind daughters
50% haemophilic colourblind sons and 50% haemophilic sons
50% haemophilic daughters and 50% colourblind daughters
Snapdragon flower is an exception of Mendel’s laws. It is a good example of
Law of dominance
Complementary gene
Codominance
Incomplete dominance