Genetics and Evolution NDA Questions

NDA BIOLOGY

Genetics and Evolution MCQ Questions


7.
Mendel's Law of Independent Assortment applies only when:
A.
Genes are located on different chromosomes
B.
Both genes are recessive
C.
Genes are located on the same chromosome
D.
Only one pair of alleles is involved
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ANSWER :
A. Genes are located on different chromosomes
8.
The F1 generation of a cross between pure tall (TT) and dwarf (tt) plants will show:
A.
50% tall, 50% dwarf
B.
All tall plants
C.
75% tall, 25% dwarf
D.
All dwarf plants
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ANSWER :
B. All tall plants
9.
Sex-linked traits in humans are mostly carried on the:
A.
Both X and Y equally
B.
X chromosome
C.
Autosomes
D.
Y chromosome
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ANSWER :
B. X chromosome
10.
Haemophilia is an example of:
A.
Y-linked disorder
B.
Autosomal dominant disorder
C.
X-linked recessive disorder
D.
X-linked dominant disorder
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ANSWER :
C. X-linked recessive disorder
11.
Colour blindness in humans is more common in males because:
A.
The gene is X-linked recessive and males have only one X chromosome
B.
Females have better vision genes on autosomes
C.
Males have lower immunity
D.
The Y chromosome causes colour blindness
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ANSWER :
A. The gene is X-linked recessive and males have only one X chromosome
12.
Down syndrome is caused by:
A.
Trisomy of chromosome 18
B.
Deletion of chromosome 5
C.
Monosomy of X chromosome
D.
Trisomy of chromosome 21
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ANSWER :
D. Trisomy of chromosome 21