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Principles of Inheritance and Variation · Question 157

AIPMT 2001MCQEasy📈 Topic in 50% papers+4−1
1

When dominant and recessive alleles express themselves together it is called

  1. Dominance
  2. Pseudo dominance
  3. Co-dominance
  4. Amphidominance

Answer

(3) Co-dominance

Solution

As per NCERT, in co-dominance the F1 resembles both parents, i.e. both alleles of a gene express themselves together.

⇒ Example: ABO blood groups, where IA and IB are both expressed in group AB.

Answer: (3)

AIPMT 2001

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2

Ratio of complementary genes is

  1. 9 : 3 : 4
  2. 9 : 7
  3. 12 : 3 : 1
  4. 9 : 3 : 3 : 4
AIPMT 2001
3

Independent assortment of genes does not take place when

  1. Genes are located on non-homologous chromosomes
  2. Genes are linked and located on same chromosome
  3. Genes are located on homologous chromosomes
  4. All the above
AIPMT 2001
4

Sickle cell anaemia is due to

  1. Change of amino acid in either or chain of haemoglobin
  2. Change of amino acid in chain of haemoglobin
  3. Change of amino acid in both and chain of haemoglobin
  4. Change of amino acid in chain of haemoglobin
AIPMT 2001
5

Number of Barr bodies in XXXX female is

  1. 3
  2. 1
  3. 2
  4. 4
AIPMT 2001
6

Male XX and female XY sometime occur due to

  1. Aneuploidy
  2. Deletion
  3. Transfer of segments in X and Y chromosomes
  4. Hormonal imbalance
AIPMT 2001
7

Probability of four sons to a couple is : -

  1. 116
  2. 18
  3. 14
  4. 132
AIPMT 2001
8

Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered:

  1. 50%
  2. 100%
  3. 75%
  4. 25%
AIPMT 2000
9

According to mendelism which character is showing dominance?

  1. Green colour in seed coat
  2. Wrinkled seed
  3. Terminal position of flower
  4. Green pod colour
AIPMT 2000
10

Mongolian idiots are due to trisomy in 21st chromosome is called:

  1. Klinefelter's syndrome
  2. Down's syndrome
  3. Turner's syndrome
  4. Triplex syndrome
AIPMT 2000
11

Erythroblastosis foetalis is caused when:

  1. Rh- female & Rh+ male
  2. Rh- female & Rh- male
  3. Rh+ female & Rh+ male
  4. Rh+ female & Rh- male
AIPMT 2000

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