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Question
Bring out the inheritance of the chloroplast gene with an example.
Solution
Chloroplast Inheritance
It is found in the 4 ‘O'Clock plant (Mirabilis jalapa). In this, there are two types of variegated leaves namely dark green-leaved plants and pale green-leaved plants. When the pollen of dark green leaved plant (male) is transferred to the stigma of the pale green leaved plant (female) and pollen of pale green leaved plant is transferred to the stigma of dark green leaved plant, the F1 generation of both the crosses must be identical as per Mendelian inheritance. But in the reciprocal cross, the F1 plant differs from each other.
In each cross, the F plant reveals the character of the plant which is used as a female plant. This inheritance is not through the nuclear gene. It is due to the chloroplast gene found in the ovum of the female plant which contributes to the cytoplasm during fertilization since the male gamete contributes only to the nucleus but not the cytoplasm.
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