Genetics AFCAT Questions

AFCAT Biology

Genetics MCQ Questions


13.
Alternative forms of a gene that occur at the same locus on homologous chromosomes are called:
A.
Alleles
B.
Operons
C.
Codons
D.
Loci
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ANSWER :
A. Alleles
14.
The observable physical or biochemical characteristics of an organism are called its:
A.
Genotype
B.
Karyotype
C.
Phenotype
D.
Genome
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ANSWER :
C. Phenotype
15.
An individual having two identical alleles for a particular trait (e.g., TT or tt) is said to be:
A.
Heterozygous
B.
Hemizygous
C.
Homozygous
D.
Nullizygous
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ANSWER :
C. Homozygous
16.
Incomplete dominance is best illustrated in the inheritance of flower colour in:
A.
Pisum sativum (Garden pea)
B.
Mirabilis jalapa (Four o'clock plant)
C.
Zea mays (Maize)
D.
Drosophila melanogaster
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ANSWER :
B. Mirabilis jalapa (Four o'clock plant)
17.
In incomplete dominance, the F2 phenotypic ratio of a monohybrid cross is:
A.
3 : 1
B.
9 : 3 : 3 : 1
C.
1 : 2 : 1
D.
2 : 1
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ANSWER :
C. 1 : 2 : 1
18.
The phenomenon in which both alleles of a heterozygous individual express themselves fully and independently is called:
A.
Codominance
B.
Incomplete dominance
C.
Epistasis
D.
Pleiotropy
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ANSWER :
A. Codominance