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Principles of Inheritance and Variation

AIPMT 2007MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2007

A common test to find the genotype of a hybrid is by:-

  1. Crossing of one F1 progeny with recessive parent
  2. Crossing of one F2 progeny with female parent
  3. Crossing of one F2 progeny with male parent
  4. Studying the sexual behaviour of F1 progenies

Answer

(1) Crossing of one F1 progeny with recessive parent

Solution

As per NCERT, the genotype of an organism showing the dominant phenotype is found by a test cross.

⇒ In a test cross, the F1 progeny (hybrid) is crossed with the parent that is homozygous recessive for the trait.

∵ The recessive parent gives only recessive gametes, the phenotypes of the progeny directly show the gametes (and hence the genotype) of the hybrid: Tt tt 1 Tt : 1 tt.

∴ A hybrid is tested by crossing one F1 progeny with the recessive parent.

Answer: (1)

Keep practising — Principles of Inheritance and Variation

Ques. 2AIPMT 2006

Both sickle cell anemia and Huntington's chorea are-

  1. Congenital disorders
  2. Bacteria-related diseases
  3. Virus-related diseases
  4. Pollutant-induced disorders
Ques. 3AIPMT 2006

Test cross involves-

  1. Crossing between two F1 hybrids
  2. Crossing the F1 hybrid with a double recessive genotype
  3. Crossing between two genotypes with recessive trait
  4. Crossing between two genotypes with dominant trait
Ques. 4AIPMT 2006

If a colour blind woman marries a normal visioned man, their sons will be

  1. All normal visioned
  2. Three-fourths colourblind and one-fourth normal
  3. One-half colourblind and one-half normal
  4. All colourblind
Ques. 5AIPMT 2006

Cri-du-chat syndrome in humans is caused by the-

  1. Loss of half of the long arm of chromosome 5
  2. Loss of half of the short arm of chromosome 5
  3. Trisomy of 21st chromosome
  4. Fertilization of an XX egg by a normal Y-bearing sperm
Ques. 6AIPMT 2006

Sickle cell anaemia has not been eliminated from the African population because-

  1. It is not a fatal disease
  2. It is controlled by dominant genes
  3. It is controlled by recessive genes
  4. It provides immunity against malaria
Ques. 7AIPMT 2006

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY × rryy?

  1. Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
  2. Only wrinkled seeds with green cotyledons
  3. Only wrinkled seeds with yellow cotyledons
  4. Only round seeds with green cotyledons
Ques. 8AIPMT 2006

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

  1. Two
  2. Nine
  3. Four
  4. Three
Ques. 9AIPMT 2006

Phenotype of an organism is the result of-

  1. Environmental changes and sexual dimorphism
  2. Cytoplasmic effects and nutrition
  3. Genotype and environment interactions
  4. Mutations and linkages
Ques. 10AIPMT 2006

Which one of the following is an example of polygenic inheritance?

  1. Skin colour in humans
  2. Pod shape in garden pea
  3. Production of male honey bee
  4. Flower colour in Mirabilis jalapa
Ques. 11AIPMT 2005

In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype -

  1. aaBB
  2. aabb
  3. AaBb
  4. AABB

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