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Principles of Inheritance and Variation · Question 149

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(2) 3 : 1

Solution

Genotype AABbCC is heterozygous only for the gene B; AA and CC are homozygous.

AA × AA → all AA (one phenotype)

CC × CC → all CC (one phenotype)

Bb × Bb → 1 BB : 2 Bb : 1 bb ⇒ 3 dominant : 1 recessive

∴ Phenotypic ratio in F2 = 1 × 3 : 1 × 1 = 3 : 1 (a monohybrid ratio)

Answer: (2)

AIPMT 2002

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2

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
3

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
4

Which of the following is a correct match -

  1. Sickle cell anaemia = X – Chromosome
  2. Down Syndrome = 21st Chromosome
  3. Haemophilia = Y – Chromosome
  4. Parkinson Disease = X & Y Chromosome
AIPMT 2002
5

Change in sequence of nucleotide in DNA is called as -

  1. Recombination
  2. Mutation
  3. Mutagen
  4. Translation
AIPMT 2002
6

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

  1. Tetraploid
  2. Monoploid
  3. Diploid
  4. Triploid
AIPMT 2002
7

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
8

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
9

When dominant and recessive alleles express themselves together it is called

  1. Dominance
  2. Pseudo dominance
  3. Co-dominance
  4. Amphidominance
AIPMT 2001
10

Ratio of complementary genes is

  1. 9 : 3 : 4
  2. 9 : 7
  3. 12 : 3 : 1
  4. 9 : 3 : 3 : 4
AIPMT 2001
11

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

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