Heredity and Variation(Mendelian Inheritance; Deviations from Mendelism Incomplete dominance, Co-dominance, Multiple alleles and Inheritance of blood groups, Pleiotropy...) NEET Questions

Biology - Genetics and Evolution

Heredity and Variation(Mendelian Inheritance; Deviations from Mendelism Incomplete dominance, Co-dominance, Multiple alleles and Inheritance of blood groups, Pleiotropy...) MCQ Questions


13.
Incomplete dominance is best illustrated by:
A.
ABO blood group system in humans
B.
Pink flower colour in Mirabilis jalapa (4 o'clock plant)
C.
Coat colour in cattle
D.
Eye colour in Drosophila
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ANSWER :
B. Pink flower colour in Mirabilis jalapa (4 o'clock plant)
14.
In incomplete dominance, the F2 phenotypic ratio is:
A.
1:2:1
B.
2:1
C.
3:1
D.
9:3:3:1
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ANSWER :
A. 1:2:1
15.
In Antirrhinum majus (snapdragon), the cross between red (RR) and white (rr) flowers produces F1 with:
A.
Pink flowers
B.
Red flowers
C.
White flowers
D.
Red and white spotted flowers
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ANSWER :
A. Pink flowers
16.
Co-dominance is exhibited by:
A.
ABO blood group system in humans
B.
Sickle cell trait expression
C.
Snapdragon flower colour
D.
Pea plant height
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ANSWER :
A. ABO blood group system in humans
17.
In co-dominance, the heterozygote shows:
A.
Only the dominant phenotype
B.
An intermediate phenotype
C.
Both parental phenotypes simultaneously
D.
Neither parental phenotype
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ANSWER :
C. Both parental phenotypes simultaneously
18.
Roan coat colour in cattle (mixture of red and white hairs) is an example of:
A.
Co-dominance
B.
Incomplete dominance
C.
Pleiotropy
D.
Multiple alleles
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ANSWER :
A. Co-dominance