Genetics and Evolution NDA Questions

NDA BIOLOGY

Genetics and Evolution MCQ Questions


1.
What is the phenotypic ratio in a monohybrid cross between two heterozygous parents (Aa × Aa)?
A.
1:1
B.
3:1
C.
9:3:3:1
D.
1:2:1
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ANSWER :
B. 3:1
2.
What is the genotypic ratio in a monohybrid cross Aa × Aa?
A.
1:2:1
B.
2:1:1
C.
3:1
D.
1:1
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ANSWER :
A. 1:2:1
3.
Mendel's Law of Segregation states that:
A.
Genes of different characters assort independently
B.
Dominant character always suppresses recessive
C.
Two alleles of a gene always blend
D.
Alleles of a gene separate during gamete formation
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ANSWER :
D. Alleles of a gene separate during gamete formation
4.
In a dihybrid cross (AaBb × AaBb), the phenotypic ratio in the F2 generation is:
A.
3:1
B.
1:1:1:1
C.
9:3:3:1
D.
1:2:1
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ANSWER :
C. 9:3:3:1
5.
A test cross involves crossing a dominant phenotype individual with:
A.
A heterozygous individual
B.
Any F1 individual
C.
A homozygous recessive individual
D.
A homozygous dominant individual
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ANSWER :
C. A homozygous recessive individual
6.
Which cross determines whether an organism showing dominant phenotype is homozygous or heterozygous?
A.
Test cross
B.
Dihybrid cross
C.
Monohybrid cross
D.
Back cross
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ANSWER :
A. Test cross