Phenotype of an organism is the result of :

(1) mutations and linkages

(2) cytoplasmic effects and nutrition

(3) environmental changes and sexual dimorphism

(4) genotype and environmental interactions.

Subtopic:  Monohybrid Cross: 1 |
 68%
NEET - 2006
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In which mode of inheritance do you expect more maternal influence among the offspring ?

(1) Autosomal

(2) Cytoplasmic

(3) Y-linked

(4) X-linked

Subtopic:  Sex Determination |
NEET - 2006
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How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

(1) Three

(2) Four

(3) Nine

(4) Two

Subtopic:  Dihybrid Cross: Details |
 65%
NEET - 2006
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Which one of the following is an example of polygenic inheritance ?

(1) Flower colour in Mirabilis jalapa 

(2) Production of male honey bee

(3) Pod shape in garden pea

(4) Skin colour in humans

Subtopic:  Polygenic Inheritance & Pleiotropy |
 92%
From NCERT
NEET - 2006
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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 x rryy ?

1. Only round seeds with green cotyledons

2. Only wrinkled with yellow cotyledons

3. Only wrinkled seeds with green cotyledons

4. Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons.

Subtopic:  Dihybrid Cross Analysis |
 87%
From NCERT
NEET - 2006
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Test cross involves :

(1) crossing between two geneotypes with recessive trait

(2) crossing between two F1 hybrids

(3) crossing the F1 hybrid with a double recessive genotype

(4) crossing between two genotypes with dominant trait

Subtopic:  Monohybrid Cross: Further Understanding |
 71%
From NCERT
NEET - 2006
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If a colourblind woman marries a normal visioned man, their sons wil be :

(1) all normal visioned

(2) one-half colourblind and one-half normal 

(3) three-fourths colourblind and one-fourth normal

(4) all colourblind

Subtopic:  Sex Linked Recessive Inheritance |
 67%
NEET - 2006
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Cri-du-chat syndrome in humans is caused by the :

(1) fertilization of an XX egg by a normal Y-bearing sperm

(2) loss of half of the short arm of chromosome 5

(3) loss of half of the long arm of chromosome 5

(4) trisomy of 21st chromosome.

Subtopic:  Recombination Gene Mapping |
 64%
NEET - 2006
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Sickle cell anaemia has not been eliminated from the African population because :

(1) it is controlled by recessive genes

(b) it is not a fatal disease

(3) it provides immunity against malaria

(4) it is controlled by a dominant genes

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 68%
NEET - 2006
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Which of the following shows linkage group in coupling phase?

(1)  A           B
a            b

(2)  A           b 
a            B

(3)  A           b
a            b

(4)  a           B
a            b

Subtopic:  Understanding Linkage |
 64%
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