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Principles of Inheritance and Variation · Question 156

AIPMT 2001MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(3) AaBb and aabb

Solution

∵ A and B are completely linked, the parent AB/ab forms only two kinds of gametes, AB and ab, and ab/ab forms only ab gametes.

⇒ AB × ab → AB/ab (AaBb) and ab × ab → ab/ab (aabb).

∴ The progeny genotypes are AaBb and aabb (1 : 1).

Answer: (3)

AIPMT 2001

Keep practising — Principles of Inheritance and Variation

2

When dominant and recessive alleles express themselves together it is called

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

Ratio of complementary genes is

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

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
5

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
6

Number of Barr bodies in XXXX female is

  1. 3
  2. 1
  3. 2
  4. 4
AIPMT 2001
7

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
8

Probability of four sons to a couple is : -

  1. 116
  2. 18
  3. 14
  4. 132
AIPMT 2001
9

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
10

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
11

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

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