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Principles of Inheritance and Variation · Question 141

AIPMT 2003MCQEasy📈 Topic in 38% papers+4−1
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:

  1. Reciprocal cross
  2. Reverse cross
  3. Test cross
  4. Dihybrid cross

Answer

(1) Reciprocal cross

Solution

In a reciprocal cross, the same two parents are crossed twice with the sexes exchanged, e.g. tall (♀) × dwarf (♂) and dwarf (♀) × tall (♂).

As per NCERT, Mendel's reciprocal crosses gave the same results, showing that the trait was not affected by the sex of the parent.

Answer: (1)

AIPMT 2003

Keep practising — Principles of Inheritance and Variation

2

Pattern baldness, moustaches and beard in human males are examples of:

  1. Sex limited traits
  2. Sex influenced traits
  3. Sex determining traits
  4. Sex linked traits
AIPMT 2003
3

Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease?

  1. Pernicious anaemia
  2. Thalassaemia
  3. Leukemia
  4. Sickle cell anaemia
AIPMT 2003
4

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?

  1. 50%
  2. 100%
  3. 75%
  4. 25%
AIPMT 2003
5

In Drosophila, the sex is determined by:

  1. X and Y chromosomes
  2. Whether the egg is fertilized or develops parthenogenetically
  3. The ratio of number of X-chromosomes to the sets of autosomes
  4. The ratio of pairs of X-chromosomes to the pairs of autosomes
AIPMT 2003
6

Christmas disease is another name for :-

  1. Hepatitis B
  2. Sleeping sickness
  3. Haemophilia B
  4. Down's syndrome
AIPMT 2003
7

Which of the following is the example of pleiotropy ?

  1. Thalassemia
  2. Haemophilia
  3. Sickle cell anaemia
  4. Colour blindness
AIPMT 2002
8

There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?

  1. a, b, c
  2. b, a, c
  3. a, c, b
  4. None
AIPMT 2002
9

On selfing a plant of F1 generation with genotype “AABbCC”, the phenotypic ratio in F2 generation will be

  1. 1 : 1
  2. 3 : 1
  3. 9 : 3 : 3 : 1
  4. 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1
AIPMT 2002
10

A gene is said to be dominant if : -

  1. It is expressed only in heterozygous condition
  2. It expresses its effect only in homozygous stage
  3. It is never expressed in any condition
  4. It is expressed both in homozygous and heterozygous condition
AIPMT 2002
11

A diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is : -

  1. Sex linked dominant
  2. Autosomal dominant
  3. Sex linked recessive
  4. Sex limited character
AIPMT 2002

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