First slide

Inheritance of One Gene

Question

Among the given below traits of organisms, identify whose phenotypes are always in heterozygous condition but never in homozygous condition.
A. Red flowered snapdragon
B. Pink flowered snapdragon
C. AB blood group individual
D. O blood group individual

Easy

A

A and B
B

B and C
C

C and D
D

A and C

Solution

The genotype for pink flowers in snapdragon is Rr. The genotype for AB blood group individual is I^A I^B.
The genotype for red flowers in snapdragon is RR. The genotype for O blood group is ‘i i’.

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