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:

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers.
Choose the incorrect statement from the following :

NEET-2019 [Principles-of-Inheritance-and-Variation] [class-xii ]

• Law of Segregation does not apply in this experiment.
• Ratio of F₂ is ¼ (Red): 2/4 (Pink): ¼ (White)
• Pink colour in F₁ is due to incomplete dominance.
• This experiment does not follow the Principle of Dominance
Correct Option: A  [ Law of Segregation does not apply in this experiment. ]

Remark:

What map unit (Centimorgan) is adopted in the construction of genetic maps?

NEET-2019 [Principles-of-Inheritance-and-Variation] [class-xii ]

• A unit of distance between two expressed genes, representing 10% cross over
• A unit of distance between two expressed genes, representing 100% cross over
• A unit of distance between genes on chromosomes, representing 50% cross over
• A unit of distance between genes on chromosomes, representing 1% cross over
Correct Option: D  [ A unit of distance between genes on chromosomes, representing 1% cross over ]

Remark:

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:

NEET-2019 [Principles-of-Inheritance-and-Variation] [class-xii ]

• T.H. Morgan
• Alfred Sturtevant
• Gregor J. Mendel
• Sutton Boveri
Correct Option: B  [ Alfred Sturtevant ]

Remark:

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

NEET-2024 [Principles-of-Inheritance-and-Variation] [class-xii ]

• bb
• BB
• BB/Bb
• Bb
Correct Option: A  [ bb ]

Remark: Explanation: NCERT Page no.70 (Topic-5.1 MENDEL'S LAWS OF INHERITANCE)

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

NEET-2024 [Principles-of-Inheritance-and-Variation] [class-xii ]

• Red flowered as well as pink flowered plants
• Only red flowered plants
• Red, Pink as well as white flowered plants
• Only pink flowered plants
Correct Option: A  [ Red flowered as well as pink flowered plants ]

Remark: Explanation: NCERT Page no.70 (Topic-5.2.2.1 Incomplete Dominance)