In some plants thalamus contributes to fruit formation. Such fruits are termed as:

NEET-(Oct)2020 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• False fruits
• Aggregate fruits
• True fruits
• Parthenocarpic fruit
Correct Option: A  [ False fruits ]

Remark:

In water hyacinth and water lily, pollination takes place by:

NEET-(Sept)2020 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• insects or wind
• water currents only
• wind and water
• insects and water
Correct Option: A  [ insects or wind ]

Remark:

The plant parts which consist of two generations - one within the other:
A. Pollen grains inside the anther
B. Germinated pollen grain with two male gametes
C. Seed inside the fruit
D. Embryo sac inside the ovule

NEET-(Sept)2020 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• (A) only
• (A), (B) and (C)
• (C) and (D)
• (A) and (D)
Correct Option: D  [ (A) and (D) ]

Remark:

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

NEET-(Sept)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• 4
• 2
• 14
• 8
Correct Option: C  [ 14 ]

Remark:

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

NEET-(Sept)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• The gene (I) has three alleles.
• A person will have only two of the three alleles.
• When I^A and I^B are present together, they express same type of sugar.
• Allele 'i' does not produce any sugar.
Correct Option: C  [ When I^A and I^B are present together, they express same type of sugar. ]

Remark:

Experimental verification of the chromosomal theory of inheritance was done by:

NEET-(Sept)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• Mendel
• Sutton
• Boveri
• Morgan
Correct Option: D  [ Morgan ]

Remark:

Select the correct match.

NEET-(Sept)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• Haemophilia -

  Y linked

• Phenylketonuria -

  Autosomal dominant trait

• Sickle cell anaemia -

  Autosomal recessive trait, chromosome-11

• Thalassemia -

  X linked

Correct Option: C  [
Sickle cell anaemia -

Autosomal recessive trait, chromosome-11
]

Remark:

The number of contrasting characters studied by Mendel for his experiments was:

NEET-(Oct)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• 14
• 4
• 2
• 7
Correct Option: D  [ 7 ]

Remark:

Chromosomal theory of inheritance was proposed by:

NEET-(Oct)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• Sutton and Boveri
• Bateson and Punnet
• T. H. Morgan
• Watson and Crick
Correct Option: A  [ Sutton and Boveri ]

Remark:

The best example for pleiotropy is:

NEET-(Oct)2020 Principles-of-Inheritance-and-Variation [class-xii ]

• Skin colour
• Phenylketoneuria
• Colour Blindness
• ABO Blood group
Correct Option: B  [ Phenylketoneuria ]

Remark: