Question

Variegated four o'clock leaves have white patches among the green areas due to

A		a recessive mutation in a nuclear gene that results in a defect in ribosomes.
B		the presence of cells in which most of the mitochondria have a mutation that blocks electron transport.
C		the presence of cells in which most of the chloroplasts have a mutation that prevents the synthesis of chlorophyll.
D		an incompletely penetrant mutation in a nuclear gene that prevents the production of chlorophyll.

Answer 1

The answer is C that is the presence of cells in which most of the chloroplasts have a mutation that prevents the synthesis of chlorophyll.

The trait of chlorophyll synthesis is an example of maternal inheritance in which the trait control genes are located in organelle other than nucleus ( Or cytoplasm) .

The synthesis of chlorophyll is control by the gene situated in chloroplast means normal gene containing cells will contain chlorophyll means they are green in colour and cells with a mutation in this gene results in the absence of synthesis of chlorophyll means these cells are not green or we can say that these cells are white in colour.