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Genetics MCQ - Multiple Choice Question and Answer

Genetics MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 15
The genetic constitution of an organism is known as

Genome
Genepool
Genotype
Phenotype

Question No : 16
In humans, an example of sex-linked trait is

Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome

Question No : 17
Down's syndrome is an example of

monosomy
trisomy
triploidy
polyploidy

Question No : 18
Which disease results from the genetic inability to synthesize a single enzyme ?

Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome

Question No : 19
Mutations which are not dominant are not lost by a gene pooL This is known as

Survival of the dominant
Survival of the recessive
Hardly-Weinberg law
None of these

Question No : 20
When two genes are situated very close to each other in a chromosome

the percentage of crossing over between themis high
hardly any cross-overs detected
no crossing-over can ever take place between them
only double cross overs can take place between them.

Question No : 21
 A person meets with an accident and great loss of blood has occurred. There is no time to analyse his blood group. It is safe to transfuse blood of

AB, RH+
AB, RH-
O, RH-
O, RH+