First slide

Inheritance of One Gene

Question

Among the following which ones do not show true breeding nature?
A. Snap dragon plant with Pink flowers B. Dwarf pea plants
C. People with AB blood group D. People with ‘O’ blood group

Easy

A

A and B
B

B and C
C

A and C
D

C and D

Solution

Heterozygous individuals are not true breeding. Snap dragon plant with pink flowers is heterozygous (Rr). People with AB blood group are always heterozygous as they have genotype as $I^{A} I^{B}$ . Dwarf pea plant is recessive one and always homozygous and it is represented as tt or dd. Similarly people with O blood group as their genotype in homozygous condition as $I^{0} I^{0}$ .

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