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Principles of Inheritance and Variation · Question 113

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

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)

AIPMT 2007

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2

Both sickle cell anemia and Huntington's chorea are-

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

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
AIPMT 2006
4

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
AIPMT 2006
5

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
AIPMT 2006
6

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
AIPMT 2006
7

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
AIPMT 2006
8

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

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

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
AIPMT 2006
10

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
AIPMT 2006
11

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
AIPMT 2005

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