151
A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab?
- AABB and aabb
- None
- AaBb and aabb
- AAbb and aabb
AIPMT 2001
Principles of Inheritance and Variation
Previous year questions with solutions · 2000 – 2026
168Questions
34Papers covered
8.91% ↑60.4%Weightage in 2026
’00
’01
’02
’03
’04
’05
’06
’07
’08
’09
’10
’11
’12
’13
’15
’16
’17
’18
’19
’20
’21
’22
’23
’24
’25
’26
Year-wise statistics questions · papers · average per paper · weightage
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 9 | 2 | 4.5 | 8.91% ↑60.4% |
| 2025 | 3 | 1 | 3 | 5.56% ↓47.2% |
| 2024 | 12 | 2 | 6 | 10.53% ↑32.6% |
| 2023 | 5 | 1 | 5 | 7.94% ↓13.4% |
| 2022 | 12 | 2 | 6 | 9.16% ↑174.8% |
| 2021 | 2 | 1 | 2 | 3.33% ↓58.3% |
| 2020 | 4 | 1 | 4 | 8.00% ↓15.2% |
| 2019 | 5 | 1 | 5 | 9.43% ↑29.7% |
| 2018 | 4 | 1 | 4 | 7.27% ↓17.1% |
| 2017 | 5 | 1 | 5 | 8.77% ↑12.1% |
| 2016 | 9 | 2 | 4.5 | 7.83% ↑42.2% |
| 2015 | 6 | 2 | 3 | 5.50% ↓23.6% |
| 2013 | 8 | 2 | 4 | 7.21% ↑48.5% |
| 2012 | 5 | 2 | 2.5 | 4.85% ↑16.5% |
| 2011 | 4 | 2 | 2 | 4.17% ↓58.3% |
| 2010 | 9 | 2 | 4.5 | 10.00% ↑40% |
| 2009 | 4 | 1 | 4 | 7.14% ↑96.4% |
| 2008 | 2 | 1 | 2 | 3.64% ↓62.9% |
| 2007 | 5 | 1 | 5 | 9.80% ↓35.7% |
| 2006 | 9 | 1 | 9 | 15.25% ↑20.1% |
| 2005 | 8 | 1 | 8 | 12.70% ↓12.7% |
| 2004 | 8 | 1 | 8 | 14.55% ↑12.7% |
| 2003 | 8 | 1 | 8 | 12.90% ↑3.2% |
| 2002 | 8 | 1 | 8 | 12.50% ↓18.1% |
| 2001 | 9 | 1 | 9 | 15.25% ↑64.7% |
| 2000 | 5 | 1 | 5 | 9.26% |
⚠ 1 of these questions are out of the current syllabus (marked on the question).
152
When dominant and recessive alleles express themselves together it is called
- Dominance
- Pseudo dominance
- Co-dominance
- Amphidominance
AIPMT 2001
153
Ratio of complementary genes is
- 9 : 3 : 4
- 9 : 7
- 12 : 3 : 1
- 9 : 3 : 3 : 4
AIPMT 2001
154
Independent assortment of genes does not take place when
- Genes are located on non-homologous chromosomes
- Genes are linked and located on same chromosome
- Genes are located on homologous chromosomes
- All the above
AIPMT 2001
155
Sickle cell anaemia is due to
- Change of amino acid in either or chain of haemoglobin
- Change of amino acid in chain of haemoglobin
- Change of amino acid in both and chain of haemoglobin
- Change of amino acid in chain of haemoglobin
AIPMT 2001
156
Number of Barr bodies in XXXX female is
- 3
- 1
- 2
- 4
AIPMT 2001
157
Male XX and female XY sometime occur due to
- Aneuploidy
- Deletion
- Transfer of segments in X and Y chromosomes
- Hormonal imbalance
AIPMT 2001
158
Probability of four sons to a couple is : -
- 116
- 18
- 14
- 132
AIPMT 2001
159
Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered:
- 50%
- 100%
- 75%
- 25%
AIPMT 2000
160
According to mendelism which character is showing dominance?
- Green colour in seed coat
- Wrinkled seed
- Terminal position of flower
- Green pod colour
AIPMT 2000
161
Mongolian idiots are due to trisomy in 21st chromosome is called:
- Klinefelter's syndrome
- Down's syndrome
- Turner's syndrome
- Triplex syndrome
AIPMT 2000
162
Erythroblastosis foetalis is caused when:
- Rh- female & Rh+ male
- Rh- female & Rh- male
- Rh+ female & Rh+ male
- Rh+ female & Rh- male
AIPMT 2000
163
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in male. It proves:
- Y chromosome is active in sex determination in both human beings and Drosophila
- In Drosophila Y-chromosome decides femaleness
- Y chromosome of man have genes for syndrome
- In human beings Y chromosome is active in sex determination
AIPMT 2000