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

1. 14 2. 4
3. 2 4. 7

Subtopic:  Introduction to Genetics: 1 |
 60%
From NCERT
NEET - 2020
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The best example of pleiotropy is:

1. Skin color 2. Phenylketonuria
3. Colour Blindness 4. ABO Blood group
Subtopic:  Polygenic Inheritance & Pleiotropy |
 69%
From NCERT
NEET - 2020
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A test cross is carried out to:

1. Predict whether two traits are linked
2. Assess the number of alleles of a gene
3. Determine whether two species or varieties will breed successfully
4. Determine the genotype of a plant at F2
Subtopic:  Monohybrid Cross: Further Understanding |
 84%
From NCERT
AIPMT - 2012
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In antirrhinum, two plants with pink flowers were hybridized. The F1 plants produced red, pink, and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization? Red flower colour is determined by RR, and White by rr genes.

1.  RR 2.  Rr
3.  rr 4.  rrrr

Subtopic:  Dominance Deviation from Mendel: 1 |
 94%
From NCERT
AIPMT - 2010
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A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called:

1. Back cross

2. Test cross

3. Dihybrid cross

4. Monohybrid cross

Subtopic:  Monohybrid Cross: Further Understanding |
 92%
From NCERT
AIPMT - 2010
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ABO blood grouping is controlled by gene I which has three alleles and shows co-dominance. There are six genotypes. How many phenotypes in all are possible?

1.  three 2.  four 
3.  five 4.  six

Subtopic:  Dominance Deviation from Mendel: 2 |
 92%
From NCERT
AIPMT - 2010
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The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of the chromosomal theory of inheritance by Morgan and his colleagues because:

1.  a single mating produces two young flies
2.  smaller female is easily recognisable from a large male
3.  it completes its life cycle in about two weeks
4.  it reproduces parthenogenetically
Subtopic:  Understanding Linkage |
 89%
From NCERT
AIPMT - 2010
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Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

1. one X and one Y chromosome
2. two X chromosomes
3. only one Y chromosome
4. only one X chromosome

Subtopic:  Sex Determination |
 89%
From NCERT
AIPMT - 2011
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Test cross in plants or in Drosophila involves crossing:
1. between two genotypes with dominant trait
2. between two genotypes with recessive trait
3. between two F1 hybrids
4. the F1 hybrid with a double recessive genotype

Subtopic:  Monohybrid Cross: Further Understanding |
 63%
From NCERT
AIPMT - 2011
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Chromosomal theory of inheritance was proposed by:

1. Sutton and Boveri

2. Bateson and Punnet

3. T. H. Morgan

4. Watson and Crick

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
 82%
From NCERT
NEET - 2020
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