1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as : -
A
Reciprocal cross
B
Reverse cross
C
Test cross
D
Dihybrid cross
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder ?
A
50%
B
100%
C
75%
D
25%
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease ?
A
Pernicius anaemia
B
Thalassaemia
C
Leukemia
D
Sickle cell anaemia
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
In Drosophila, the sex is determined by : -
A
X and Y chromosomes
B
Whether the egg is fertilized or develops parthenogenetically
C
The ratio of number of X-chromosomes to the sets of autosomes
D
The ratio of pairs of X-chromosomes to the pairs of autosomes
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