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Principles of Inheritance and Variation · Question 154

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

If a diploid cell is treated with colchicine then it becomes : -

  1. Tetraploid
  2. Monoploid
  3. Diploid
  4. Triploid

Answer

(1) Tetraploid

Solution

Colchicine inhibits the formation of spindle fibres during cell division.

⇒ The chromosomes replicate and the chromatids separate, but they cannot move to the poles and the cell does not divide.

∴ The chromosome number doubles: 2n 4n, i.e. a diploid cell becomes tetraploid.

As per NCERT, failure of cytokinesis after telophase leads to an increase in a whole set of chromosomes, called polyploidy.

Answer: (1)

AIPMT 2002

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2

Two non-allelic genes produce the new phenotype when present together but fail to do so independently then it is called

  1. Polygene
  2. Complementary gene
  3. Non-complementary gene
  4. Epistasis
AIPMT 2001
3

A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab?

  1. AABB and aabb
  2. None
  3. AaBb and aabb
  4. AAbb and aabb
AIPMT 2001
4

When dominant and recessive alleles express themselves together it is called

  1. Dominance
  2. Pseudo dominance
  3. Co-dominance
  4. Amphidominance
AIPMT 2001
5

Ratio of complementary genes is

  1. 9 : 3 : 4
  2. 9 : 7
  3. 12 : 3 : 1
  4. 9 : 3 : 3 : 4
AIPMT 2001
6

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
7

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
8

Number of Barr bodies in XXXX female is

  1. 3
  2. 1
  3. 2
  4. 4
AIPMT 2001
9

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
10

Probability of four sons to a couple is : -

  1. 116
  2. 18
  3. 14
  4. 132
AIPMT 2001
11

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

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